若何测量白光led灯的寿命[优质文档]

若何测量白光led灯的寿命[优质文档]若何测量白光led灯的寿命[优质文档] 如何测量白光LED灯的寿命 Lifespan in LEDs, especially in White LEDs, is a very misunderstood concept. This is mainly because of the two ideas behind a LEDs true lifespan: Lumen Depreciation and Useful Life. Lumen Depreciation is the decrease in lume...

若何测量白光led灯的寿命[优质文档] 如何测量白光LED灯的寿命 Lifespan in LEDs, especially in White LEDs, is a very misunderstood concept. This is mainly because of the two ideas behind a LEDs true lifespan: Lumen Depreciation and Useful Life. Lumen Depreciation is the decrease in lumen output that occurs as a lamp operates. Whether for incandescents, halogen, fluorescents or LEDs this measures the decrease in the amount of light they emit over time. LED的寿命，特别是白光LED的寿命是一个容易被误解的概念。这主要是因为LED 真实的寿命后面隐藏的两大概念:流明衰减和有用时间。流明衰减发生在灯泡点亮过程中流明输出的减少。无论是白炽灯、卤素灯、荧光灯还是LED灯，这都测量了这些灯泡在未来散发光数量的减少。 The second critical idea is Useful Life. Unlike other light sources, LEDs don’t “burn out;” they simply get dimmer over time. Although there is not yet an official industry standard defining “life” of an LED, for a common application such as general lighting in an office or home environment, research has shown that the majority of occupants in a space will accept light level reductions of up to 30 per cent with little notice, particularly if the reduction is gradual. 第二个关键性的概念是有用时间。不像其他光源，LED灯不会“熄灭”;它们只会随着时间增长变暗。尽管目前还没有官方的行业MATCH_ word _1714029151839_0来定义LED灯的“寿命”，对于一般如办公室或家庭的普通照明这些应用，研究表明大部分拥有者都会接受 30%以下亮度的降低，不会有什么察觉，特别是如果这种降低是渐变的时候。 Therefore, a level of 70 per cent of initial light level could be considered a threshold of useful life for general lighting. Based on this research, the Alliance for Solid State Illumination Systems and Technologies (ASSIST), a group led by the Lighting Research Center (LRC) in the USA recommends defining useful life as the point at which light output has declined to 70 per cent of initial lumens (abbreviated as L70) for general lighting and 50 per cent (L50) for LEDs used for decorative purposes. 因此，初始亮度的70%可以被当做普通照明有用时间的一个门槛。基于该研究，由美国光电研究中心领头的一个组织—固态照明系统及技术联盟推荐把对于普通照明光衰至70%定义为有用时间，装饰用途的LED可达50%。 Using this definition, at normal operating temperatures, the best white LEDs have been found to have a useful life of around 35,000-50,000 hours (that’s between four and six years of continuous operation). For comparison, a 75-watt incandescent light bulb lasts about 1,000 hours; a comparable CFL lasts 8,000 to 10,000 hours. However, LED lifetime depends greatly on operating temperature. An increase in operating temperature of 10 ?C can cut the useful life of an LED in half. 使用该定义，在常温下，最好的白光LED的寿命可达三万五到五万小时(也就是可以用4到6年)。相比较而言，一支75瓦的白炽灯可达1千小时;功率大致一样的紧凑型荧光灯(俗称节能灯)可达8千到1万小时。然而，LED灯的寿命在很大程度上取决于工作温度。工作温度每增加10 ?C会使LED灯的寿命降低一半。

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若何测量白光led灯的寿命[优质文档]

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