提出了一种基于加速性能退化的LED灯具可靠性快速评估方法。以LED灯具的使用寿命评估为目标, 设计了温度和电应力的恒定应力加速退化试验及其加速模型, 给出了基于性能退化的LED灯具可靠性评估一般流程。以国内某型LED灯管为试验对象, 对其可靠性进行了评价: 在正常应力水平下, 该型LED灯管的寿命评估值为31 571 h。结果表明该方法能够快速、有效地评估LED灯管的可靠性。该方法不仅节省实验时间, 而且对LED灯具的可靠性评估及产品质量管理有一定的参考价值。

A rapid reliability evaluation method of LED lamp was proposed based on the acceleration degradation test. In order to evaluate the service life of lamps, the accelerated degradation test(ADT)was conducted under the integrated stress of temperature-electrical, and a general procedure for an accelerated degradation test was used to analyze the useful lifetime of LED lamps under operating conditions through analyzing the lumen maintenance data collected from ADT. The reliability of a type of LED tube was evaluated implementing the approach proposed in this article. The failure criterion was defined as the 70% decrease of the emitted optical power compared with the initial level. The results show that the failure time of a LED tube under operating conditions is about 31 571 h. This designed procedure can evaluate the reliability of LED lamps quickly and effectively. It not only can save the experiment time, but also provide the foundation for evaluating reliability and managing product quality.