【摘 要】
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LED based lighting products are becoming popular due to continuous cost reduction,quality improvement and incentives from governments.Luminous flux maintena
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LED based lighting products are becoming popular due to continuous cost reduction,quality improvement and incentives from governments.Luminous flux maintenance and color stability are two important factors to evaluate the lighting quality.While much research efforts have been put on the former,research activities and achievements on the latter have lagged behind.With increased adoption and accumulation of hours of use,awareness is growing that color shift is an issue for some products,especially in some important application fields,such as museums,patient examination rooms,urban scene illumination occasions,offices,and so on.
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