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http://dx.doi.org/10.7782/JKSR.2015.18.2.111

Conceptual Design for Lifetime Test System for LED Headlamps on Rolling Stock  

Ohn, Jung-Ghun (Metropolitan Transit System Research Division, Korea Railroad Research Institute)
Jeong, Ki-Seok (Metropolitan Transit System Research Division, Korea Railroad Research Institute)
Chung, Jong-Duk (Metropolitan Transit System Research Division, Korea Railroad Research Institute)
Publication Information
Journal of the Korean Society for Railway / v.18, no.2, 2015 , pp. 111-116 More about this Journal
Abstract
LED luminaires as a lighting system have attracted much research attention due to their high efficiency and long lifetimes. However, disappointing outcomes have been noted in terms of performance levels and lifetimes as compared to desired system requirements in practice due to certain electrical and thermal characteristics of LEDs. LM-80 and TM-21 established by IESNA are the best known standards for lifetime test procedures and estimation techniques. However, they only handle LED light sources without guaranteeing the LED luminaire in a reliability test. They also operate for more than 6,000 hours and undergo various stresses, such as the operating current and temperature. Therefore, a lifetime standard for LED luminaires has not yet been established. This paper proposes a conceptual design of a lifetime test system for LED headlamps depending on the operating environment. Eventually, this method can assist with evaluations of the validity of lifetime standard tests of LED headlamps.
Keywords
LED Headlamp; Lifetime Test; Rolling Stock;
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