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Theory of light
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acting area adjusted air conditioning allow angle bar units barndoor barrel unit bars blue cables cameras carbon channel circuit colour temperature console control system counterweight cyclorama device dichroic filters dimmer racks dimmer room discharge lamp discharge sources effects electrical electricians ensure equipment fader Figure filament film industry film studios filter Fresnel lens fuse glass green halogen lamp height illumination input installation lens light beam light level light output light source lighting control lighting control console lighting control system lighting system load luminaire manufacturers mechanical meter metre monopole motorized pantograph mounted normal NTSC obviously operation overload pantograph plug position possible practice premises problems produce profile spots radiation reflector rigging safety scenery SECAM self-climbing sockets Softlight spectrum stage standard supply suspension switch television studios theatre thyristor trackways usually voltage wavelengths winch wire ropes