以下为句子列表：
英文: An incandescent lamp or its glass housing.
中文: 灯泡白炽灯或其玻璃外罩
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英文: Feature:It is kind of incandescent lamp made according to the circulation principle of tungsten and halogen.It has the advantages of small size,high luminance,good color devlopment,long life and convenient use,etc.
中文: 特点：卤钨灯是根据卤钨循环原理制成的白炽灯，具有体积小、亮度高、显色性好、寿命长、使用方便等特点。
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英文: From the point of view of experiment , This article first calculates the spectrum power distribution of incandescent lamp , fluorescent lamp , high2pressure sodium lamp and the metal2halide lamp , then calculates the ratio of visible spectrum power to the
中文: 本文从实验的角度,通过计算得到白炽灯、节能灯、高压钠灯和金卤灯的光谱能量分布图,并计算得到这四种灯的可见波段能量所占总能量的比例,从而理论上证明了白炽灯光效低,而高压钠灯和金卤灯的光效较高。
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