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://chefesquipmenters.shop/product-category/butter-knives/