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In recent years, Light emitting diodes (LEDs) has become more and more popular because of their low power consumption, low-pollution and long-life. Currently, the common lumen maintenance test of LED follows IES LM80-08 standard, which costs at least 6000 hours for measurement and prolongs the time-to-market schedule. In our previous researches, a modified accelerated aging test algorithm using different...
Thermal resistance of high power blue Light Emitting Diode (LED) package is experimentally examined. The LED package consists of eight CREE EZ900 chips. The dimension of each chip is 880 µm×880 µm and the metal board area is 30 mm×32 mm with 3 mm thickness. The LED package is operated at the current of 11 A with 10 % duty cycle. To measure junction temperature, the forward voltage method is used....
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