The degradation mechanism of mid-power GaN-based white LEDs were investigated by using the in-situ multi-functional accelerated aging tests. The changes of the luminous flux and the chromaticity shift during the stress time show some correlations. To quantitatively analyze the degradation behavior. a composite model considering the luminous flux increasing and decreasing mechanisms wa... https://parisnaturalfoodes.shop/product-category/f-c-l-non-gelatin/