什么是自然光
自然光是一种近似太阳光照明的光源。其特点是开尔文温度约为 5000 开尔文，显色指数 (CRI) 为 100。自然光 开尔文温度 自然光的显色指数在一天中会有变化，通常在 5000 到 6000 开尔文之间，具体取决于一天中的时间和云层等因素。CRI 是用来描述与自然光相比，光源呈现色彩准确程度的指标。一般认为，CRI 在 90 以上的光源才能被归类为自然光。
有些公司可能对什么是自然光有自己的解释，但普遍认为色温为 6500 开尔文、显色指数为 82-84 的灯不符合自然光的标准。同样，色温为 4100 开尔文、显色指数较高的灯具也不能被视为自然光源，因为其光色与太阳光偏差很大，几乎不相似。
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