Prediction of lifetime by lumen degradation and color shift for LED lamps, in a non-accelerated reliability test over 20,000 h

doi:10.1364/ao.58.001855

CIOMP OpenIR

	Prediction of lifetime by lumen degradation and color shift for LED lamps, in a non-accelerated reliability test over 20,000 h
	J.Hao; H.L.Ke; L.Jing; Q.Sun; R.T.Sun
	2019
发表期刊	Applied Optics
ISSN	1559-128X
卷号	58 期号:7 页码:1855-1861
摘要	Although the predicted lifetime of the classical 6000 h test given by Energy Star is taken as the normal lifetime of LED products in most research and applications, the aim of this study is to explore the error in lifetime prediction of LED lamps based on the 6000 h test. A non-accelerated aging test with 10 LED lamps is conducted for 20,000 h (from March 2016 to now) under room temperature, which is long enough for this kind of lamp reaching the real lifetime with the normalized luminous flux dropping to 70% naturally. At different aging periods, the correspondent lifetime of each sample is predicted by the lumen degradation, and the median lifetime tau(0.5) of 10 samples is obtained by applying the Weibull distribution. Result shows that the tau(0.5) of the real lifetime is 16,867 h in this work, and the aging time should be at least 9000 h to make the error in predicting the lifetime less than 3%. On the other hand, the Du'v' values of 0.006, 0.007, and 0.008 are taken as the three thresholds for predicting the lifetime by color shift. For the case of 0.008, the calculated shape parameter of 8.4 in Weibull distribution is similar with that of the real lifetime, which means the Du'v' of 0.008 for this kind of lamp gives the same failure mechanism as that of lumen degradation of 70%. (C) 2019 Optical Society of America
关键词	online,design,Optics
DOI	10.1364/ao.58.001855
URL	查看原文
收录类别	SCI
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/63339
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	J.Hao,H.L.Ke,L.Jing,et al. Prediction of lifetime by lumen degradation and color shift for LED lamps, in a non-accelerated reliability test over 20,000 h[J]. Applied Optics,2019,58(7):1855-1861.
APA	J.Hao,H.L.Ke,L.Jing,Q.Sun,&R.T.Sun.(2019).Prediction of lifetime by lumen degradation and color shift for LED lamps, in a non-accelerated reliability test over 20,000 h.Applied Optics,58(7),1855-1861.
MLA	J.Hao,et al."Prediction of lifetime by lumen degradation and color shift for LED lamps, in a non-accelerated reliability test over 20,000 h".Applied Optics 58.7(2019):1855-1861.

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