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High power light emitting diodes (HPLEDs) based semiconductor solid-state lighting has been hailed as the new energy-saving lighting source that can replace the conventional lighting sources due to its high efficiency, long life, environmental protection and compact size. So far, there are a lot of different LED products on the market, including LED bulb, LED spot light, LED landscape lamp, etc. All...
High junction temperature accelerates the degradation of the chips and the package materials of high power light emitting diodes (LEDs). In this paper, two experiments were conducted to investigate the fluctuation of junction temperature in the aging process. At the ambient temperature of 65°C, the samples from four different types of LED packages were used to investigate the variation of junction...
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