> Quick answer: SMD LEDs in solar lamps are known for maintaining brightness over time; however, their lifespan can vary significantly due to factors like lumen depreciation rates, component failures, and environmental conditions such as temperature [2]. The actual lifetime is often less than the claimed 100,000-hour lifespan, and while they generally degrade gradually, their performance can be influenced by specific use conditions and applications [2][6][24][25].
LED Luminaire Lifetime and Lumen Degradation: A Comprehensive Overview
LEDs (Light Emitting Diodes) have revolutionized lighting technology with their energy efficiency, longevity, and versatility. But when assessing the lifespan of an LED luminaire or lamp, several factors must be considered, including lumen depreciation over time, component failures, and environmental conditions. This article provides a comprehensive understanding of these aspects based on available research and industry insights.
Understanding Lumen Degradation: A Gradual Process
Lumen maintenance is a critical metric for determining the lifetime of LED lighting products [5]. Unlike traditional light sources that abruptly fail, LEDs gradually lose brightness over time due to lumen depreciation [1][2][7][12]. This characteristic poses challenges in accurately measuring and characterizing LED fixture lifetimes [4][5], especially given their potentially long lifespans.
The rate of lumen degradation varies depending on factors such as drive current, use conditions, and the specific type of LED [2]. For instance, red LEDs experience slower light output depreciation compared to white or blue LEDs [24]. This variation in degradation rates underscores the importance of considering the intended application when assessing an LED fixture’s lifetime.
Defining LED Lifetime: L70 and Beyond
The convention for defining LED lifetime is typically based on 70% of original brightness, denoted as L70 [3][12][16]. This means that at the point where an LED’s light output has decreased to 70% of its initial level, it is considered to have reached the end of its useful life. However, this is not a hard cutoff; LEDs can continue operating beyond this point but may no longer meet performance specifications or regulatory requirements [2].
Some manufacturers and researchers go further than L70, specifying lifetimes based on other lumen maintenance levels such as L90 (90% of original brightness) [16] or even extrapolating to estimate lifetimes exceeding 100 years [16][25]. These longer estimates are often based on controlled laboratory conditions and may not account for real-world factors that can impact LED performance.
Factors Affecting LED Lifetime: Component Failures, Temperature, and More
While lumen depreciation is a significant factor in determining LED lifetime, it’s not the only one. Other components within an LED fixture or lamp, such as drivers [22], thermal management devices [5], and optical components [5], can also impact long-term performance. Failures in these components may occur before the LEDs themselves reach their lumen maintenance threshold, thereby limiting the overall lifetime of the product.
Temperature is another critical factor influencing LED lifespan. The Arrhenius equation predicts that for every 10°C decrease in temperature, the lifetime of semiconductors and electrolytic capacitors (common components within LED fixtures) can double [22]. This means that operating an LED fixture at a lower temperature can significantly extend its useful life.
Industry Standards and Testing Methods: A Work in Progress
The Illuminating Engineering Society of North America (IESNA) has developed test methods such as LM-80 to measure lumen depreciation of LED light sources [5] and TM-21 to extrapolate long-term lumen maintenance projections [5][23]. These standards aim to provide a consistent framework for assessing LED lifetime.
However, the industry is still evolving in terms of defining accepted protocols for measuring and characterizing luminaire lifetime [4][18]. This is partly due to the cost associated with testing a large number of product samples [4] and the rapid pace of technological advancements in LEDs [6], which can make it challenging to keep up with real-world performance data.
Practical Considerations: Choosing LED Lighting Products
When selecting LED lighting products, several factors come into play beyond just brightness (measured in lumens) [20]. Battery capacity (measured in mAh), durability (IP rating), and ease of installation are also important considerations for solar LED lights specifically [20].
For outdoor applications, factors such as luminous efficiency (Watts-to-lumens), lumen output relative to task requirements, correlated color temperature, and color rendering index should be taken into account when choosing LED products [11]. Regular maintenance, including cleaning solar panels and checking battery connections, can help prolong the life of these lights [15].
The Bottom Line: LEDs Offer Longevity but with Considerations
LEDs offer significantly longer lifespans compared to traditional light sources like halogens or fluorescents [3][11], often lasting a decade or more before needing replacement. However, it’s important to note that the claimed 100,000-hour lifespan for LEDs is not always accurate in real-world applications and may be misleading [6][24][25].
The actual lifetime of an LED luminaire depends on a variety of factors including drive current, use conditions, component failures, temperature, and the specific application. While LEDs generally maintain brightness over time, their performance can degrade gradually, leading to potential issues with color rendering or efficacy [2].
References
- [1] LED_Life_Standards_In_And_Out_Of_Luminaires_-_Electronic_Design__258a2761 — magazine
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# LED Life Standards In And Out Of Luminaires Source: Blog/Web URL: https://www.electronicdesign.com/technologies/industrial/boards/article/21789940/led-life-standards-in-and-out-of-luminaires Author: Don Tuite Date: 2009-03-26 The U.S. Department of Energy (DoE) notes that LED luminaires and replacement lamps available today often claim long life, usually 50,000 hours, based solely on the estimated lumen depreciation of the LED. But the DoE also says that life claims ought to account for the whole system. The lifetimes of incandescent, fluorescent, and high-intensity discharge lamps are generally estimated through industry standards. Typically, a large, statistically significant sample of lamps is operated until 50% have failed. That point, in terms of operating hours, defines the “rated life” for that lamp. LEDs are different. They usually don’t fail abruptly. Their light output slowly diminishes over time. Moreover, they can have such long lives that life testing and acquiring real application data on long-term reliability becomes problematic—new versions of products are available before current ones can be fully tested. Finally, they’re often integrated permanently into the fixture, making their replacement difficult or impossible. Coupled with that, the light output and useful life of individual LEDs are more influenced by electrical and thermal conditions determined by the luminaire and system design, rather than by native properties of the LEDs themselves. All of that
- [2] Measuring_Maintenance_of_Light_Output_Characteristics_of_Solid-State__b693c248 — magazine
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# Measuring Maintenance of Light Output Characteristics of Solid-State Light Sources Source: Blog/Web URL: https://store.ies.org/product/lm-80-21-measuring-maintenance-of-light-output-characteristics-of-solid-state-light-sources/?v=eb65bcceaa5f Author: Date: 2026-01-01 Product Description LEDs typically exhibit very long operational life characteristics and, depending on drive current and use conditions, can be in use for 50,000 hours or longer. The light output from LEDs slowly decreases over time. This characteristic of declining output without sudden and permanent failure creates a risk that an LED-based lighting product near end of life may be operating but performing outside the product’s specification, or outside required codes, standard practices, or regulations. LEDs may also undergo gradual shifts in the emitted spectrum over time that may result in unacceptable appearance or color rendering, or degraded efficacy. This document provides the methods for measurement of luminous flux and color maintenance for LED packages, arrays, and modules. It covers luminous, radiant, or photon flux maintenance and color maintenance, including changes in chromaticity coordinates, peak wavelength, or centroid wavelength versus time. The maintenance characteristics are measured under controlled conditions that allow direct comparison of results obtained at different laboratories. Page count: 15 pages Publisher: Illuminating Engineering Society (2021) SKU: ANSI/IES LM-80-21 ISBN-13: 97
- [3] LED_Lighting_in_Museums_and_Art_Galleries_Technical_-_Canadaca__7f9b6307 — authority
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replacement. The convention for defining LED lifetime is 70% of original brightness, abbreviated as L70. The lifespan (L70) of LED lamps is so much longer than all previous lamps (Table 1) that it changes the way one thinks of bulb replacement. Instead of the twice-a-year replacement needed for halogens, LED lamps will need changing just once a decade. Long lamp lifetime offers several advantages to museums, not just the reduction of labour but also the reduction of the risk to collections due to accidents during lamp changes. Lumen output (brightness of LEDs) Initially, white LEDs only came in low lumen (lm) ratings, often as low as 50 lm. For the museum situation of low-intensity lighting at close quarters (such as in display cases), this was a boon. For lighting at a distance from high ceilings, it was a problem. Those who considered LED lamps in 2011 faced problems finding ones with sufficient intensity, not to mention good-quality light. Today, most manufacturers provide reliable advice on which LED lamp to use when replacing a particular size of incandescent lamp. More sophisticated users can rely on the lumen and beam intensity data provided by manufacturers. Why warranties matter To make good LEDs, manufacturers must select phosphors with the right spectrum, arrange the phosphors and the blue (or violet) LEDs so that the correct portion of the LEDs is absorbed by the phosphors, manufacture them in large quantities that are identical and make sure the mix remains stabl
- [4] How_to_measure_LED_lamp_life_-_Electronic_Design__73f56efa — magazine
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# How to measure LED lamp life Source: Blog/Web URL: https://www.electronicdesign.com/technologies/components/lighting/lighting-systems/article/21193520/how-to-measure-led-lamp-life Author: Date: 2011-07-22 In fact, LED lumen depreciation quite often doesn't determine the lifetime of a well-made luminaire. The report further says many manufacturers estimate luminaire lifetime using LED lumen maintenance figures, which can give misleading results. This practice can be particularly bad for fixture manufacturers because it impacts whether or not the fixture will last as long as the manufacturer's warranty. "The statement '100,000 hours of LED luminaire lifetime' is gradually giving way to the realization that there is little consistency, very little published data, and few hard facts around so-called luminaire lifetime numbers," says the report. But the situation is better at the LED package level, it says, where reputable manufacturers have thousands of hours of data under varying conditions. All in all, there is still no accepted protocol for measuring and characterizing LED fixture lifetime. One reason is that it can be costly to make such measurements due to the large number of product samples such tests require. "But as we learn more about the behavior of these LED 'systems,' it becomes evident that the life of a fixture may be considerably shorter than what is indicated by nominal light depreciation, albeit still generally longer than many incumbent lighting solutions," th
- [5] Lumen-maintenance_testing_for_LED_lamps_light_engines_Buildings__ea530613 — authority
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# Lumen-maintenance testing for LED lamps, light engines and luminaires (MAGAZINE) Source: Blog/Web URL: https://www.buildings.com/architecture/interiors/article/55255355/lumen-maintenance-testing-for-led-lamps-light-engines-and-luminaires-magazine Author: Date: 2012-02-02 +++++ This article was published in the February 2012 issue of LEDs Magazine. View the Table of Contents and download the PDF file of the complete February 2012 issue. +++++ It is widely understood that measuring lumen maintenance is critically important for determining the life of LED lighting products. In the past few years, the Illuminating Engineering Society of North America (IESNA) has developed two test methods that address the lumen maintenance of LED light sources used in such products. LM-80 is an approved method for measuring lumen depreciation of LED light sources, and TM-21 is a technical memorandum which specifies how to extrapolate the LM-80 data in order to make long-term lumen-maintenance projections. Beyond the LED, other components at the LED lighting-system level also can impact the long-term lumen maintenance. These components include, but are not limited to, LED lamps, engines, luminaires, drivers, thermal-management devices and optical components. Over time, these components may experience some change or degradation. In particular, the plastic elements used in the optics may change in several ways, including light transmittance, haze and undesired color change. In turn, the overall li
- [6] LED_package_designs_tackle_lumen_depreciation_issues_-_News__dda53ead — magazine
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lumen depreciation issues by properly extracting the heat and by packaging the LEDs in materials that do not degrade over time. Even traditional light sources, such as incandescent, halogen, fluorescent and metal halide lamps exhibit light output degradation over their operating life. Figure 3 shows a comparison of light output variation over time for different white-light sources. The high-power LEDs have very low light output degradation, according to the preliminary data in figure 3. Advances in device construction, light extraction and heat sinking have enabled the development of high-power LEDs that offer improved luminous efficacy and better lumen maintenance. These advances have made white LED technology more feasible for general lighting applications. If the LED industry can sustain these development trends, solid-state lighting could have significant market penetration in the next 5 to 10 years. The future of LEDs in lighting With LED performance improving, solid-state lighting is attracting more attention from the lighting world. The general illumination marketplace is huge, but penetrating that marketplace will require higher value LED products. Manufacturers will have to continue working on longer-lasting white LEDs with higher efficacy, higher luminous flux and improved color properties. The Lighting Research Center is currently identifying the parameters that can be improved to provide quality lighting that is acceptable to human subjects. Illumination using LED
- [7] LED_output_doesnt_dwindle_Laser_Focus_World__fd46adfc — magazine
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# LED output doesn't dwindle Source: Blog/Web URL: https://www.laserfocusworld.com/lasers-sources/article/16552304/led-output-doesnt-dwindle Author: Date: 2002-09-01 Light-emitting diodes (LEDs) intended for general illumination have a lot going for them—they are rugged, they produce high-quality white light, and they last. But to the everyday people who may one day light their houses with LEDs, the lifetime of a light source means more than just the number of hours it shines before it winks out for good. Although today's white-light-emitting LEDs are quite reliable, lasting for many thousands of hours, they are also just as reliably fade in output over time. Engineers at Lumileds (San Jose, CA) have developed LEDs that fade less over time (a characteristic known in the industry as high "lumen maintenance"). They have improved their devices so that they now produce 90% of their original output after 9000 h—in contrast to 40% after 9000 h for conventional LEDs. The new emitters are projected to maintain 70% of their original output after 50,000 h. New package Back when visible LEDs were used as indicator lights and little else, they were molded into bullet-shaped epoxy packages. Even now, after the advent of high-brightness gallium nitride-based blue- and white-emitting LEDs, the epoxy bullet still exists in the form of the standard 5-mm package. But, in these devices, the epoxy encapsulant is affected by the ultraviolet or blue output of the LED chip, with the result that the
- [11] New_IDA_LED_Lighting_Practical_Guide_DarkSky_International__5711810c — authority
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of potentially harmful blue light. (see below). Relative to other commonly-used outdoor lamps, LEDs are thought to be extremely long-lived. Laboratory studies indicate lifetime ratings in the range of 25,000-100,000 hours of continuous operation, making them virtually maintenance-free. When turned on, LEDs are instantly at full brightness, unlike HID lamps that have a significant time delay. LEDs also have very low minimum energy thresholds to produce light, meaning they can be dimmed to much lower illumination levels when less light is needed, resulting in further energy savings. Product Selection Considerations Choosing LED products for outdoor lighting applications involves a series of considerations and tradeoffs. These include: – Luminous Efficiency (Watts-to-lumens): How many lumens of light are produced per input Watt of electricity? More importantly, how many lumens from the light source are meeting the task (“Fixture Lumens” vs. “Lamp Lumens”) – Lumen Output: How much light is produced relative to the amount required for a particular task? When replacing existing fixtures it is important to use the only level of illumination needed, and not to adopt unneeded increases in brightness. – Correlated Color Temperature (CCT): Does the light have a “warm” or “cool” color quality? – Color Rendering Index (CRI): How accurately does the light render colors to the human eye? A high CRI is not needed for all situations. The need for good color rendition should be considered rela
- [12] What_Happened_To_The_100000-Hour_LED_Bulbs_-_Hackaday__a70b0bb9 — authority
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in Douglas MacArthur’s famous line, old LEDs don’t die, they just fade away. We all know what an incandescent lamp failure looks like: one second it’s burning bright; the next, it’s not (and every once-in-a-while, you hear a pop followed by a faint jingling as the liberated filament richochets inside the bulb). Power supplies aside, LEDs typically don’t fail with so much fanfare. Instead, they gradually lose brightness as they age. In the lighting industry, this is known as lumen depreciation, and is a separate failure mode from the catastrophic failure we usually think about. As it turns out, lumen depreciation happens to incandescent bulbs, too. By the end of their 1,000 hour life, the output has typically dropped 10-15%, but nobody ever notices. With LEDs, the effect is much worse, and the output continues to fall as the device ages. At some point, the LED is no longer producing enough light to fulfill its original purpose, even though it hasn’t “burned out.” Research says that most users won’t notice a gradual 30% drop in light levels; accordingly the industry has defined L70, the time at which the output has dropped to 70% of its initial level, as an endpoint for measuring LED bulb lifetime. Based on how it’s estimated, this measure is typically stated as B50-L70, the point at which 50% of an initial sample of bulbs will retain 70% of their rated output. Color Shift Happens But is Unpredictable Something else happens as phosphor-based white LEDs age: they change color. T
- [15] The_Best_Solar_Path_Lights_Family_Handyman__678b96d2 — reddit
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lights do wear out over time, but their lifespan can vary depending on several factors,” Price says. “The batteries in these lights typically last between one to three years. Over time, the battery’s capacity will diminish, leading to shorter illumination periods. Solar panels themselves can also degrade, losing efficiency after several years of exposure to the elements. The materials used in the lights, such as plastics and metals, will also experience wear and tear due to weather conditions like UV exposure, rain, and temperature changes.” Price also notes that the LEDs used in solar lights tend to “have a long lifespan, often up to 50,000 hours, so they are unlikely to be the first component to fail. Regular maintenance, such as cleaning the solar panels and checking the battery connections, can help prolong the life of your solar path lights.” How long do solar path lights last? Solar path lights span two to five years, depending on the materials they’re crafted from. The update of the lighted also dictates their longevity. What is the downside of solar path lights? The only downside to solar-powered lights is that when seasons begin to change, and darkness sets in earlier, the lights can lose their charge, which normally lasts for eight to twelve hours. Once the weather changes, the light’s performance can also change temporarily. Also, don’t forget to check out these awesome solar fence lights and solar lights for camping.
- [16] Some_Lumileds_LEDs_have_an_extrapolated_L70_lifetime_of_114__14d66c45 — magazine
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# Some Lumileds LEDs have an extrapolated L70 lifetime of 114 years Source: Blog/Web URL: https://www.laserfocusworld.com/lasers-sources/article/16569715/some-lumileds-leds-have-an-extrapolated-l70-lifetime-of-114-years Author: John Wallace Date: 2017-04-11 LED maker Lumileds (San Jose, CA), which is the company that first came up with lumen-maintenance testing for LEDs in 2008, today (April 11, 2017) let it be known that it is the only company that has met the premium specifications of the DesignLights Consortium (DLC) in four main product families. Some of Lumileds' manufacturing and testing processes that the company says it has been improving over the years include: epitaxy, new phosphor development, die fabrication, and in-situ process control, with more than 3 billion device-hours of testing under its belt. LED lifetimes Because lighting LEDs tend to wane in output over time rather than burn out like an incandescent bulb, their lifetime specifications take this into account. When an LED is new, it will have an output of a certain number of lumens. This number of lumens gradually decreases; at the time when the LED output has waned to 90% of its original lumens, the LED is said to have reached its L90 lifetime. Similarly, at 70% of its output, the LED has reached its L70 lifetime, and 50% of its output defines its L50 lifetime. The lighting LED industry has taken the L70 lifetime as its standard. In contrast, the L90 standard is much stricter. Even so, many of Lumileds'
- [18] DOE_Publishes_Updated_Recommendations_for_Testing_and__8a12392f — authority
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# DOE Publishes Updated Recommendations for Testing and Reporting LED Luminaire Lifetime Source: Blog/Web URL: https://www.led-professional.com/resources-1/led-reports-roadmaps/doe-publishes-updated-recommendations-for-testing-and-reporting-led-luminaire-lifetime Author: Date: 2011-07-21 What for the Guideline is intended: Like the first edition of the guide, this second edition is a set of recommendations for reporting and demonstrating luminaire product lifetime. Initially, we sought to provide guidance for the Lighting Facts® program, which gives users, retailers, and manufacturers a common short-form reporting mechanism to improve the quality of solid-state lighting products on the market. The Lighting Facts label provides a summary of key performance criteria but does not include lifetime, for which there have been numerous requests. Ideally, it would be the addition of a single number, e.g., “eight years.” We attempted, in the first edition, to suggest some descriptions which would better describe lifetime, and it is fair to say that there are fewer wild claims in the marketplace. Yet there is still not an accepted protocol for measuring and characterizing lifetime. In part, this is due to cost, as a fair number of product samples must be tested to get good numbers, but it is also due in some measure to the industry’s early emphasis on lumen depreciation. Until recently, LED products have been described as “different” from conventional technologies—LEDs will just get di
- [20] Solar_Led_Light_Outdoor_-_Solar_Lights__774af4fd — authority
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# Results for solar led light outdoor Source: Blog/Web URL: https://www.bing.com/aclick?ld=e8CM4EJNiyLRWjDYjBnhX6YjVUCUwIamGSDeD9fuvJQ4eSou_4JHl1yBdCJzqci9KFNzGFaxBrRAKZpS1ySPVQgSWIjiZ6GGB12FbXNNhhubXWdNFM4-PSTW95siho3l0GcRb9e4hqSMSPWppS7z4xeaHWX-WyPNmMpXBd6WRWsyMvXnjSSlJP84fH2J7FX8k6atNJ4Q&u=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&rlid=d306e4b4ce8d158a72488e8383e6dff7 Author: Date: 2024-08-16 What Are the Key Features to Look for in a Solar LED Light Outdoor? Answer: When choosing a solar LED light outdoor, focus on brightness (measured in lumens), battery capacity (measured in mAh), durability (IP rating), and installation ease. These features determine the light’s performance and longevity. To select the best solar LED light outdoor for you
- [22] What_Happened_To_The_100000-Hour_LED_Bulbs_-_Hackaday__a70b0bb9 — authority
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might be responsible for failures. The US Department of Energy (DoE)’s solid-state lighting program supports research and development of LED technologies, and their website contains volumes of data on LED lighting systems. Their Lifetime and Reliability Fact Sheet contains data on the failure rate of 5,400 outdoor lamps over 34 million hours of operation. Interestingly, the LEDs themselves account for only 10% of the failures; driver circuitry, on the other hand, was responsible almost 60% of the time. The remainder of failures were due to housing problems, which may not be as applicable for bulbs in indoor use. This data shows that at least for catastrophic failures (where the lamp ceases to emit light), extending lifetime means improving the power supplies. Locate the Weakest Link: Component Lifetime The lifetime of a bulb (or power supply) can be no longer than the lifetime of any of its components. Among the components found inside the bulbs, two stand out as life-limiters: the semiconductors and the electrolytic capacitors. Both of these components suffer from a failure rate that is a strong function of temperature. The typical model for this effect, based on the Arrhenius equation, predicts a doubling of lifetime for each 10 degree Celsius decrease in temperature, at least over a limited range. The two longer-lived bulbs use twice as many packages to carry approximately the same number of LED dice as the GE Basic lamp, decreasing thermal resistance to their respective h
- [23] Understanding_the_difference_between_LED_rated_life_and_Buildings__730bf80c — authority
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# Understanding the difference between LED rated life and lumen-maintenance life (MAGAZINE) Source: Blog/Web URL: https://www.buildings.com/home/article/55259473/understanding-the-difference-between-led-rated-life-and-lumen-maintenance-life-magazine Author: Date: 2011-10-21 With the completion of the IES test method TM-21-11 (see page 9), the SSL industry now has a standard method of obtaining long-term lumen-maintenance information for LED light sources. The method is made up of two steps. First, the LED light sources must be tested per LM-80. The new TM-21 method is then applied to the collected measurement data to make lumen-maintenance projections, including in-situ temperature calculations. However, there is still one measure that is missing: the rated life for LED light sources. Rated life is an essential reliability property for LED integrators that design LED luminaires, providing luminaire users with warranty and usage information Rated life The rated life of a lamp or light source is defined, per ANSI/IES RP-16, as “the life value assigned to a particular type lamp. This is commonly a statistically-determined estimate of median operational life.” The rated life in hours of an LED lamp or light source, specified by the manufacturer, applies under certain operational conditions and for defined failure criteria. The statistical measure for the rated life is designated Bp and is measured in hours, where p is a percentage. For example, a B50 rated life of 1,000 hours mea
- [24] LED_package_designs_tackle_lumen_depreciation_issues_-_News__dda53ead — magazine
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et al. 2000 and 2001a). Yet, despite this information, as well as numerous articles which have shown that 5 mm white LEDs degrade very rapidly, many manufacturers continue to claim that they will last 100,000 hours. Another recent publication showed that even the different colored 5 mm LEDs do not degrade the same way over time (Narendran et al. 2001b). These LEDs were tested in a temperature-controlled room, and they were mounted on printed circuit boards as shown in figure 1. The light output degradation of LEDs with different colors is shown in figure 2. The light output of the red LEDs depreciated at a much slower rate than that of the white LEDs, while green and blue LEDs degraded at an intermediate rate. LEDs packaged inside an enclosed fixture, where the ambient temperature is higher than in the temperature-controlled study, will experience higher degradation rates. Therefore, the claim of 100,000 hours life for LED fixtures that use housed arrays of 5 mm LEDs, white or colored, is deceiving. The LEDs may indeed last 100,000 hours, but their light output may not be sufficient for the fixture s intended application. A useful life of 5000 hours may be more appropriate for the 5 mm LED fixtures. Newer LED packages Standard 5 mm LED packages were originally designed for use in indicator applications, but their design does not allow for sufficient heat transfer from the LED chip to keep it cool during operation. As the temperature of the chip increases, the device degrades
- [25] The_truth_about_LED_lifespan_and_the_longevity_of_your_displayRanges_S__61570ca6 — authority
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# The truth about LED lifespan and the longevity of your display Source: Blog/Web URL: https://insights.samsung.com/2022/05/23/the-truth-about-led-lifespan-and-the-longevity-of-your-display/ Author: Samsung Date: 2022-05-23 How long will your LED display last? In nearly every industry, from retail businesses to concert halls to corporate centers, decision makers need to evaluate the return on investment (ROI) of their LED signage. In most cases, potential buyers go straight to the obvious place: the LED manufacturer’s spec sheet. The industry standard for LED lifespan is 100,000 hours, or about 10 years, and most people assume that’s how long their display will last. But it’s not quite that simple. The 100,000-hour figure assumes that every diode will be running at full brightness, consistently — which, on an LED screen, is virtually never the case. The lifespan figure can also be misleading because it indicates when a diode degrades to half-brightness, not completely dark. Many other variables affect an LED display’s lifespan; you can’t rely solely on the number on the diode spec sheet. What other factors influence your LED display’s lifespan? “The reality is, your screen can often last significantly longer than 100,000 hours,” says Kevin Izatt, a senior product manager in Samsung’s Display division. “We’ve had displays that have been up for 15-plus years with more than adequate brightness. Because the diode is actually only one factor in the lifespan of your LED display.” H
# LED Life Standards In And Out Of Luminaires Source: Blog/Web URL: https://www.electronicdesign.com/technologies/industrial/boards/article/21789940/led-life-standards-in-and-out-of-luminaires Author: Don Tuite Date: 2009-03-26 The U.S. Department of Energy (DoE) notes that LED luminaires and replacement lamps available today often claim long life, usually 50,000 hours, based solely on the estimated lumen depreciation of the LED. But the DoE also says that life claims ought to account for the whole system. The lifetimes of incandescent, fluorescent, and high-intensity discharge lamps are generally estimated through industry standards. Typically, a large, statistically significant sample of lamps is operated until 50% have failed. That point, in terms of operating hours, defines the “rated life” for that lamp. LEDs are different. They usually don’t fail abruptly. Their light output slowly diminishes over time. Moreover, they can have such long lives that life testing and acquiring real application data on long-term reliability becomes problematic—new versions of products are available before current ones can be fully tested. Finally, they’re often integrated permanently into the fixture, making their replacement difficult or impossible. Coupled with that, the light output and useful life of individual LEDs are more influenced by electrical and thermal conditions determined by the luminaire and system design, rather than by native properties of the LEDs themselves. All of that
# Measuring Maintenance of Light Output Characteristics of Solid-State Light Sources Source: Blog/Web URL: https://store.ies.org/product/lm-80-21-measuring-maintenance-of-light-output-characteristics-of-solid-state-light-sources/?v=eb65bcceaa5f Author: Date: 2026-01-01 Product Description LEDs typically exhibit very long operational life characteristics and, depending on drive current and use conditions, can be in use for 50,000 hours or longer. The light output from LEDs slowly decreases over time. This characteristic of declining output without sudden and permanent failure creates a risk that an LED-based lighting product near end of life may be operating but performing outside the product’s specification, or outside required codes, standard practices, or regulations. LEDs may also undergo gradual shifts in the emitted spectrum over time that may result in unacceptable appearance or color rendering, or degraded efficacy. This document provides the methods for measurement of luminous flux and color maintenance for LED packages, arrays, and modules. It covers luminous, radiant, or photon flux maintenance and color maintenance, including changes in chromaticity coordinates, peak wavelength, or centroid wavelength versus time. The maintenance characteristics are measured under controlled conditions that allow direct comparison of results obtained at different laboratories. Page count: 15 pages Publisher: Illuminating Engineering Society (2021) SKU: ANSI/IES LM-80-21 ISBN-13: 97
replacement. The convention for defining LED lifetime is 70% of original brightness, abbreviated as L70. The lifespan (L70) of LED lamps is so much longer than all previous lamps (Table 1) that it changes the way one thinks of bulb replacement. Instead of the twice-a-year replacement needed for halogens, LED lamps will need changing just once a decade. Long lamp lifetime offers several advantages to museums, not just the reduction of labour but also the reduction of the risk to collections due to accidents during lamp changes. Lumen output (brightness of LEDs) Initially, white LEDs only came in low lumen (lm) ratings, often as low as 50 lm. For the museum situation of low-intensity lighting at close quarters (such as in display cases), this was a boon. For lighting at a distance from high ceilings, it was a problem. Those who considered LED lamps in 2011 faced problems finding ones with sufficient intensity, not to mention good-quality light. Today, most manufacturers provide reliable advice on which LED lamp to use when replacing a particular size of incandescent lamp. More sophisticated users can rely on the lumen and beam intensity data provided by manufacturers. Why warranties matter To make good LEDs, manufacturers must select phosphors with the right spectrum, arrange the phosphors and the blue (or violet) LEDs so that the correct portion of the LEDs is absorbed by the phosphors, manufacture them in large quantities that are identical and make sure the mix remains stabl
# How to measure LED lamp life Source: Blog/Web URL: https://www.electronicdesign.com/technologies/components/lighting/lighting-systems/article/21193520/how-to-measure-led-lamp-life Author: Date: 2011-07-22 In fact, LED lumen depreciation quite often doesn't determine the lifetime of a well-made luminaire. The report further says many manufacturers estimate luminaire lifetime using LED lumen maintenance figures, which can give misleading results. This practice can be particularly bad for fixture manufacturers because it impacts whether or not the fixture will last as long as the manufacturer's warranty. "The statement '100,000 hours of LED luminaire lifetime' is gradually giving way to the realization that there is little consistency, very little published data, and few hard facts around so-called luminaire lifetime numbers," says the report. But the situation is better at the LED package level, it says, where reputable manufacturers have thousands of hours of data under varying conditions. All in all, there is still no accepted protocol for measuring and characterizing LED fixture lifetime. One reason is that it can be costly to make such measurements due to the large number of product samples such tests require. "But as we learn more about the behavior of these LED 'systems,' it becomes evident that the life of a fixture may be considerably shorter than what is indicated by nominal light depreciation, albeit still generally longer than many incumbent lighting solutions," th
# Lumen-maintenance testing for LED lamps, light engines and luminaires (MAGAZINE) Source: Blog/Web URL: https://www.buildings.com/architecture/interiors/article/55255355/lumen-maintenance-testing-for-led-lamps-light-engines-and-luminaires-magazine Author: Date: 2012-02-02 +++++ This article was published in the February 2012 issue of LEDs Magazine. View the Table of Contents and download the PDF file of the complete February 2012 issue. +++++ It is widely understood that measuring lumen maintenance is critically important for determining the life of LED lighting products. In the past few years, the Illuminating Engineering Society of North America (IESNA) has developed two test methods that address the lumen maintenance of LED light sources used in such products. LM-80 is an approved method for measuring lumen depreciation of LED light sources, and TM-21 is a technical memorandum which specifies how to extrapolate the LM-80 data in order to make long-term lumen-maintenance projections. Beyond the LED, other components at the LED lighting-system level also can impact the long-term lumen maintenance. These components include, but are not limited to, LED lamps, engines, luminaires, drivers, thermal-management devices and optical components. Over time, these components may experience some change or degradation. In particular, the plastic elements used in the optics may change in several ways, including light transmittance, haze and undesired color change. In turn, the overall li
lumen depreciation issues by properly extracting the heat and by packaging the LEDs in materials that do not degrade over time. Even traditional light sources, such as incandescent, halogen, fluorescent and metal halide lamps exhibit light output degradation over their operating life. Figure 3 shows a comparison of light output variation over time for different white-light sources. The high-power LEDs have very low light output degradation, according to the preliminary data in figure 3. Advances in device construction, light extraction and heat sinking have enabled the development of high-power LEDs that offer improved luminous efficacy and better lumen maintenance. These advances have made white LED technology more feasible for general lighting applications. If the LED industry can sustain these development trends, solid-state lighting could have significant market penetration in the next 5 to 10 years. The future of LEDs in lighting With LED performance improving, solid-state lighting is attracting more attention from the lighting world. The general illumination marketplace is huge, but penetrating that marketplace will require higher value LED products. Manufacturers will have to continue working on longer-lasting white LEDs with higher efficacy, higher luminous flux and improved color properties. The Lighting Research Center is currently identifying the parameters that can be improved to provide quality lighting that is acceptable to human subjects. Illumination using LED
# LED output doesn't dwindle Source: Blog/Web URL: https://www.laserfocusworld.com/lasers-sources/article/16552304/led-output-doesnt-dwindle Author: Date: 2002-09-01 Light-emitting diodes (LEDs) intended for general illumination have a lot going for them—they are rugged, they produce high-quality white light, and they last. But to the everyday people who may one day light their houses with LEDs, the lifetime of a light source means more than just the number of hours it shines before it winks out for good. Although today's white-light-emitting LEDs are quite reliable, lasting for many thousands of hours, they are also just as reliably fade in output over time. Engineers at Lumileds (San Jose, CA) have developed LEDs that fade less over time (a characteristic known in the industry as high "lumen maintenance"). They have improved their devices so that they now produce 90% of their original output after 9000 h—in contrast to 40% after 9000 h for conventional LEDs. The new emitters are projected to maintain 70% of their original output after 50,000 h. New package Back when visible LEDs were used as indicator lights and little else, they were molded into bullet-shaped epoxy packages. Even now, after the advent of high-brightness gallium nitride-based blue- and white-emitting LEDs, the epoxy bullet still exists in the form of the standard 5-mm package. But, in these devices, the epoxy encapsulant is affected by the ultraviolet or blue output of the LED chip, with the result that the
of potentially harmful blue light. (see below). Relative to other commonly-used outdoor lamps, LEDs are thought to be extremely long-lived. Laboratory studies indicate lifetime ratings in the range of 25,000-100,000 hours of continuous operation, making them virtually maintenance-free. When turned on, LEDs are instantly at full brightness, unlike HID lamps that have a significant time delay. LEDs also have very low minimum energy thresholds to produce light, meaning they can be dimmed to much lower illumination levels when less light is needed, resulting in further energy savings. Product Selection Considerations Choosing LED products for outdoor lighting applications involves a series of considerations and tradeoffs. These include: – Luminous Efficiency (Watts-to-lumens): How many lumens of light are produced per input Watt of electricity? More importantly, how many lumens from the light source are meeting the task (“Fixture Lumens” vs. “Lamp Lumens”) – Lumen Output: How much light is produced relative to the amount required for a particular task? When replacing existing fixtures it is important to use the only level of illumination needed, and not to adopt unneeded increases in brightness. – Correlated Color Temperature (CCT): Does the light have a “warm” or “cool” color quality? – Color Rendering Index (CRI): How accurately does the light render colors to the human eye? A high CRI is not needed for all situations. The need for good color rendition should be considered rela
in Douglas MacArthur’s famous line, old LEDs don’t die, they just fade away. We all know what an incandescent lamp failure looks like: one second it’s burning bright; the next, it’s not (and every once-in-a-while, you hear a pop followed by a faint jingling as the liberated filament richochets inside the bulb). Power supplies aside, LEDs typically don’t fail with so much fanfare. Instead, they gradually lose brightness as they age. In the lighting industry, this is known as lumen depreciation, and is a separate failure mode from the catastrophic failure we usually think about. As it turns out, lumen depreciation happens to incandescent bulbs, too. By the end of their 1,000 hour life, the output has typically dropped 10-15%, but nobody ever notices. With LEDs, the effect is much worse, and the output continues to fall as the device ages. At some point, the LED is no longer producing enough light to fulfill its original purpose, even though it hasn’t “burned out.” Research says that most users won’t notice a gradual 30% drop in light levels; accordingly the industry has defined L70, the time at which the output has dropped to 70% of its initial level, as an endpoint for measuring LED bulb lifetime. Based on how it’s estimated, this measure is typically stated as B50-L70, the point at which 50% of an initial sample of bulbs will retain 70% of their rated output. Color Shift Happens But is Unpredictable Something else happens as phosphor-based white LEDs age: they change color. T
lights do wear out over time, but their lifespan can vary depending on several factors,” Price says. “The batteries in these lights typically last between one to three years. Over time, the battery’s capacity will diminish, leading to shorter illumination periods. Solar panels themselves can also degrade, losing efficiency after several years of exposure to the elements. The materials used in the lights, such as plastics and metals, will also experience wear and tear due to weather conditions like UV exposure, rain, and temperature changes.” Price also notes that the LEDs used in solar lights tend to “have a long lifespan, often up to 50,000 hours, so they are unlikely to be the first component to fail. Regular maintenance, such as cleaning the solar panels and checking the battery connections, can help prolong the life of your solar path lights.” How long do solar path lights last? Solar path lights span two to five years, depending on the materials they’re crafted from. The update of the lighted also dictates their longevity. What is the downside of solar path lights? The only downside to solar-powered lights is that when seasons begin to change, and darkness sets in earlier, the lights can lose their charge, which normally lasts for eight to twelve hours. Once the weather changes, the light’s performance can also change temporarily. Also, don’t forget to check out these awesome solar fence lights and solar lights for camping.
# Some Lumileds LEDs have an extrapolated L70 lifetime of 114 years Source: Blog/Web URL: https://www.laserfocusworld.com/lasers-sources/article/16569715/some-lumileds-leds-have-an-extrapolated-l70-lifetime-of-114-years Author: John Wallace Date: 2017-04-11 LED maker Lumileds (San Jose, CA), which is the company that first came up with lumen-maintenance testing for LEDs in 2008, today (April 11, 2017) let it be known that it is the only company that has met the premium specifications of the DesignLights Consortium (DLC) in four main product families. Some of Lumileds' manufacturing and testing processes that the company says it has been improving over the years include: epitaxy, new phosphor development, die fabrication, and in-situ process control, with more than 3 billion device-hours of testing under its belt. LED lifetimes Because lighting LEDs tend to wane in output over time rather than burn out like an incandescent bulb, their lifetime specifications take this into account. When an LED is new, it will have an output of a certain number of lumens. This number of lumens gradually decreases; at the time when the LED output has waned to 90% of its original lumens, the LED is said to have reached its L90 lifetime. Similarly, at 70% of its output, the LED has reached its L70 lifetime, and 50% of its output defines its L50 lifetime. The lighting LED industry has taken the L70 lifetime as its standard. In contrast, the L90 standard is much stricter. Even so, many of Lumileds'
# DOE Publishes Updated Recommendations for Testing and Reporting LED Luminaire Lifetime Source: Blog/Web URL: https://www.led-professional.com/resources-1/led-reports-roadmaps/doe-publishes-updated-recommendations-for-testing-and-reporting-led-luminaire-lifetime Author: Date: 2011-07-21 What for the Guideline is intended: Like the first edition of the guide, this second edition is a set of recommendations for reporting and demonstrating luminaire product lifetime. Initially, we sought to provide guidance for the Lighting Facts® program, which gives users, retailers, and manufacturers a common short-form reporting mechanism to improve the quality of solid-state lighting products on the market. The Lighting Facts label provides a summary of key performance criteria but does not include lifetime, for which there have been numerous requests. Ideally, it would be the addition of a single number, e.g., “eight years.” We attempted, in the first edition, to suggest some descriptions which would better describe lifetime, and it is fair to say that there are fewer wild claims in the marketplace. Yet there is still not an accepted protocol for measuring and characterizing lifetime. In part, this is due to cost, as a fair number of product samples must be tested to get good numbers, but it is also due in some measure to the industry’s early emphasis on lumen depreciation. Until recently, LED products have been described as “different” from conventional technologies—LEDs will just get di
# Results for solar led light outdoor Source: Blog/Web URL: https://www.bing.com/aclick?ld=e8CM4EJNiyLRWjDYjBnhX6YjVUCUwIamGSDeD9fuvJQ4eSou_4JHl1yBdCJzqci9KFNzGFaxBrRAKZpS1ySPVQgSWIjiZ6GGB12FbXNNhhubXWdNFM4-PSTW95siho3l0GcRb9e4hqSMSPWppS7z4xeaHWX-WyPNmMpXBd6WRWsyMvXnjSSlJP84fH2J7FX8k6atNJ4Q&u=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&rlid=d306e4b4ce8d158a72488e8383e6dff7 Author: Date: 2024-08-16 What Are the Key Features to Look for in a Solar LED Light Outdoor? Answer: When choosing a solar LED light outdoor, focus on brightness (measured in lumens), battery capacity (measured in mAh), durability (IP rating), and installation ease. These features determine the light’s performance and longevity. To select the best solar LED light outdoor for you
might be responsible for failures. The US Department of Energy (DoE)’s solid-state lighting program supports research and development of LED technologies, and their website contains volumes of data on LED lighting systems. Their Lifetime and Reliability Fact Sheet contains data on the failure rate of 5,400 outdoor lamps over 34 million hours of operation. Interestingly, the LEDs themselves account for only 10% of the failures; driver circuitry, on the other hand, was responsible almost 60% of the time. The remainder of failures were due to housing problems, which may not be as applicable for bulbs in indoor use. This data shows that at least for catastrophic failures (where the lamp ceases to emit light), extending lifetime means improving the power supplies. Locate the Weakest Link: Component Lifetime The lifetime of a bulb (or power supply) can be no longer than the lifetime of any of its components. Among the components found inside the bulbs, two stand out as life-limiters: the semiconductors and the electrolytic capacitors. Both of these components suffer from a failure rate that is a strong function of temperature. The typical model for this effect, based on the Arrhenius equation, predicts a doubling of lifetime for each 10 degree Celsius decrease in temperature, at least over a limited range. The two longer-lived bulbs use twice as many packages to carry approximately the same number of LED dice as the GE Basic lamp, decreasing thermal resistance to their respective h
# Understanding the difference between LED rated life and lumen-maintenance life (MAGAZINE) Source: Blog/Web URL: https://www.buildings.com/home/article/55259473/understanding-the-difference-between-led-rated-life-and-lumen-maintenance-life-magazine Author: Date: 2011-10-21 With the completion of the IES test method TM-21-11 (see page 9), the SSL industry now has a standard method of obtaining long-term lumen-maintenance information for LED light sources. The method is made up of two steps. First, the LED light sources must be tested per LM-80. The new TM-21 method is then applied to the collected measurement data to make lumen-maintenance projections, including in-situ temperature calculations. However, there is still one measure that is missing: the rated life for LED light sources. Rated life is an essential reliability property for LED integrators that design LED luminaires, providing luminaire users with warranty and usage information Rated life The rated life of a lamp or light source is defined, per ANSI/IES RP-16, as “the life value assigned to a particular type lamp. This is commonly a statistically-determined estimate of median operational life.” The rated life in hours of an LED lamp or light source, specified by the manufacturer, applies under certain operational conditions and for defined failure criteria. The statistical measure for the rated life is designated Bp and is measured in hours, where p is a percentage. For example, a B50 rated life of 1,000 hours mea
et al. 2000 and 2001a). Yet, despite this information, as well as numerous articles which have shown that 5 mm white LEDs degrade very rapidly, many manufacturers continue to claim that they will last 100,000 hours. Another recent publication showed that even the different colored 5 mm LEDs do not degrade the same way over time (Narendran et al. 2001b). These LEDs were tested in a temperature-controlled room, and they were mounted on printed circuit boards as shown in figure 1. The light output degradation of LEDs with different colors is shown in figure 2. The light output of the red LEDs depreciated at a much slower rate than that of the white LEDs, while green and blue LEDs degraded at an intermediate rate. LEDs packaged inside an enclosed fixture, where the ambient temperature is higher than in the temperature-controlled study, will experience higher degradation rates. Therefore, the claim of 100,000 hours life for LED fixtures that use housed arrays of 5 mm LEDs, white or colored, is deceiving. The LEDs may indeed last 100,000 hours, but their light output may not be sufficient for the fixture s intended application. A useful life of 5000 hours may be more appropriate for the 5 mm LED fixtures. Newer LED packages Standard 5 mm LED packages were originally designed for use in indicator applications, but their design does not allow for sufficient heat transfer from the LED chip to keep it cool during operation. As the temperature of the chip increases, the device degrades
# The truth about LED lifespan and the longevity of your display Source: Blog/Web URL: https://insights.samsung.com/2022/05/23/the-truth-about-led-lifespan-and-the-longevity-of-your-display/ Author: Samsung Date: 2022-05-23 How long will your LED display last? In nearly every industry, from retail businesses to concert halls to corporate centers, decision makers need to evaluate the return on investment (ROI) of their LED signage. In most cases, potential buyers go straight to the obvious place: the LED manufacturer’s spec sheet. The industry standard for LED lifespan is 100,000 hours, or about 10 years, and most people assume that’s how long their display will last. But it’s not quite that simple. The 100,000-hour figure assumes that every diode will be running at full brightness, consistently — which, on an LED screen, is virtually never the case. The lifespan figure can also be misleading because it indicates when a diode degrades to half-brightness, not completely dark. Many other variables affect an LED display’s lifespan; you can’t rely solely on the number on the diode spec sheet. What other factors influence your LED display’s lifespan? “The reality is, your screen can often last significantly longer than 100,000 hours,” says Kevin Izatt, a senior product manager in Samsung’s Display division. “We’ve had displays that have been up for 15-plus years with more than adequate brightness. Because the diode is actually only one factor in the lifespan of your LED display.” H