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照明灯为什么要装灯罩?_灯具_设计456问答
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照明灯为什么要装灯罩?
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2个答案
灯罩一般都是抛物线的,灯泡在抛物线的焦点上,而且大部分都是白色或者金属色的,从物理学上说,这些都可以帮助灯泡的光反射,会起到增强亮度的作用。