An optimized model for lifetime prediction of LED-based light  bars using luminance degradation method

Abstract

An optimized model is established to improve the accuracy and efficiency of lifetime estimation for LED-based light bars. A Weibull function is used to fit test data of remaining luminance under two groups of accelerated stresses, and a method for determining the optimal test time is put forward. The results show that the optimized model for lifetime prediction best reflects the characteristic of luminance degradation. Furthermore, the error of the accelerated lifetime first decreases and then increases, finally decreasing again, which confirms that the method for determining the optimal test time is feasible given the level of accuracy required.

Impact of the LED-based light source working regime on the degradation of polymethyl methacrylate

“…In order to improve the precision of the lifetime prediction, Zhang et al . 3 used a Weibull luminance degradation function. Successful implementation of this model provided a convenient tool for the evaluation of various optoelectronic devices as well.…”

“…The importance of a LED-based product's lifetime prediction was specifically shown in the paper by Padmasali and Kini., 2 where the analysis of the lumen depreciation and colour shift was undertaken with the use of various ageing models. In order to improve the precision of the lifetime prediction, Zhang et al 3 used a Weibull luminance degradation function. Successful implementation of this model provided a convenient tool for the evaluation of various optoelectronic devices as well.…”