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62.2: Invited Paper : LED Life Versus LED System Life
Author(s) -
Narendran Nadarajah,
Liu Yiwei
Publication year - 2015
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1002/sdtp.10402
Subject(s) - led lamp , light emitting diode , reliability engineering , component (thermodynamics) , computer science , engineering , electrical engineering , physics , thermodynamics
The useful life of an LED is presently determined by the IESNA LM80‐08 lumen maintenance standard. Even though an LED system has many components, the current industry practice rates LED system lifetime based on a single component, namely, the LED. LED system life is one of the least understood parameters, especially in application environments. As a result, any lifetime claim for a complete LED lighting system, such as a lamp or luminaire, is a guess. This paper describes an accelerated life test of an LED system to predict the lifetime at any given environment temperature and system use (ON‐OFF) pattern.