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In this paper, the thermal stability and the colour shifting of remote phosphor plates, made from Bisphenol-A polycarbonate (BPA-PC), are studied. In this study, the remote-phosphor and lens of BPA-PC samples of 3 mm thickness were thermally aged at temperature range 100 to 140 ºC. Results show that thermal ageing leads to a significant decrease in the luminous flux and chromatic properties of plates...
This paper investigated the correlation of activation energy between LED light source and LED luminaire in lumen depreciation test. Two nonlinear fitting methods were used to verify the stability of the different algorithms to extract the activation energy. The results show that the activation energy of LED luminaire is very close to the LED light source. Activation Energy is typically around 0.20eV...
A 2-stage acceleration theory for luminous flux depreciation testing at LED lamp/luminaire level is developed to reduce the test time from 6,000 hours to less than 2,000 hours. Such an acceleration theory is based on the exponential decay model and Arrhenius acceleration equation. Three key parameters, namely, activation energy, operating junction temperature, and accelerated testing junction temperature...
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