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日本牛尾光源(ushio lighting)开发出了平均显色指数(ra)高达97的LED聚光灯“cool spot LED”，面向商业照明;光源采用紫色LED芯片和红色、绿色及蓝
https://www.alighting.cn/pingce/20110809/122807.htm2011/8/9 15:01:07
