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Horace He
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What is Ghost Light
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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What is Dark Adaptation
Dark adaptation is the process by which the eyes adjust and recover their sensitivity in low light conditions after being exposed to bright lights.
What is Center Beam Candlepower (CBCP)
Center Beam Candlepower (CBCP) is the luminous intensity at the center of the beam emitted by a lamp or luminaire.