Study on the estimation of the LED‐package life using a statistical approach

Abstract

AbstractSince the LED has been popularly used in the lighting field, many of the standards for LED lights such as those regarding LED modules, LED luminaries, and LED lamps have been renewed or newly published. In the development of the relevant standards, many other standards for LED appurtenances have also been developed to measure the LED packages and to produce the luminous flux, color chromaticity, color rendering index, and luminous‐intensity distribution. Although many standards has been developed for different purposes, a standard for the projection of the lumen maintenance of the LED packages and luminaires is nonexistent. LED products are widely known for their long lifetimes, but the formation of accurate definitions of their life periods and the lumen maintenance regarding the LED products are not possible due to the LED‐package components such as the phosper material and the soldering techniques. The method in the IES LM‐80‐08 had been mainly used as an alternative for the projection of the lumen maintenance, but an active discussion of the Border Function and Temperature Acceleration methods in terms of their use as current international standards has occurred. In this study, a new equation for the lumen‐maintenance projection is proposed for the accurate measurement of the lumen maintenance for which a set of 12 LED packages is used. By using the equation, the real value of the LED‐product life can be easily estimated, and it can be compared with the manufacturer claim regarding the value of the LED‐product life.