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Horace He
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ゴーストライト（フットライト／常夜灯）とは
A ghost light is a term to describe a single lamp that is left illuminated on stage when the theater is not in use.
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暗順応とは
Dark adaptation is the process by which the eyes adjust and recover their sensitivity in low light conditions after being exposed to bright lights.
中心光度（CBCP）とは
中心光度（CBCP）とは、ランプまたは器具から放射される光線の中心における光度のことです。