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

철도차량용 LED전조등의 수명시험 장치 구축을 위한 개념설계

  • 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)
  • Received : 2014.12.17
  • Accepted : 2015.04.15
  • Published : 2015.04.30

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.

Acknowledgement

Grant : 3세부 고휘도(100만 칸델라급) LED전조등 개발

Supported by : 국토교통부

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Cited by

  1. Performance Assessment of a Temperature Control Unit used in a Lifecycle Testing System for LED Headlamps on Locomotives vol.19, pp.1, 2016, https://doi.org/10.7782/JKSR.2016.19.1.46