显色指数Ra
含义：物体颜色在光源照射下与太阳光照射下的相似程度
单位：无
其他：太阳光的显色指数定义为100
备注：指数（Ra） 等级
90-100 1A 优良 需要色彩精确对比的场所
80-89 1B 需要色彩正确判断的场所
60-79 2 普通 需要中等显色性的场所
40-59 3 对显色性的要求较低，色差较小的场所
20-39 4 较差 对显色性无具体要求的场所
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