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The Luminosity Function
The Illumination System
Measurement of Illumination
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angle apparent intensity applied approximately average illumination ballast black-body radiator candlepower candles per sq ceiling cell cent circuit coefficient of utilization color considered constant determined diffusing dimensions distance dominant wavelength effect efficiency Electric element emission Engg equation equipment evaluated example filament filter floodlighting floor fluoren fluorescent lamps flux emitted foot-candles ft-c ft-L glass hence horizontal Ilium incandescent lamps intensity distribution curve interreflection irradiation Lighting Handbook louver lumens luminaires luminosity function luminous efficacy luminous flux luminous source measured medium mercury-vapor lamp method Micron mounting height observer obtained operating panel plot Prob produce projectors radiant energy radiant power rated ratio rationalized brightness reflection factor relative room coefficient room index shown in Fig spacing specified spectral reflection spectroradiometric sq ft Staggered 25 standard street surface Table tained in serv task temperature tion transmission factor tristimulus unit values vertical visibility voltage wall watts wavelength