反复的电压波动引起白炽灯光度的变化。
Repetitive voltage fluctuations cause brightness variations in incandescent elements.
太阳光是非相干光，白炽灯光也是非相干光。
The light from the sun is incoherent light, so is the light from an incandescent bulb.
变色萤石在日光下呈灰蓝色，在白炽灯光下呈红紫色。
The effect is greyish blue in the sunlight and reddish purple in the incandescent lamp light.
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