Due to the intrinsic characteristics of artificial lighting source, its light output in all exists certain stroboscopic.

由于人工照明光源的固有特性，其光输出中都存在着一定的频闪。

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Until the advent of artificial lighting, the sun was the major source of lighting, and people spent their evenings in (relative) darkness.

在人工照明发明之前，太阳是主要的光线来源，人们的夜晚时间都是在(相对)黑暗中渡过。

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The first is the general lighting, natural light source from the outside world and an artificial lighting that is a variety of lighting equipment.

首先是一般照明，来源于外界天体的自然光源和一种是人工照明即各种照明设备。

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