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Radiant Energy as Waves
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angle arc tube argon Assume average background luminance ballast beam blackbody blackbody radiator bulb calculated candelas cavity ratio ceiling chromaticity coordinates collisions color component configuration factor contrast curve daylight diagram direction distance electric electron emitted equation example Figure filament floodlight fluorescent lamps focal footcandles gas atoms given glare glass high-intensity discharge lamps horizontal illuminance incandescent lamp increases initial lumens ionization lamp lumens laser lens light source lm/W located luminaire luminous efficacy luminous exitance luminous flux luminous intensity maximum mercury lamp meter obtain optical overcast sky perfectly diffusing photon plane polarized power density procedure produced radiation reflected reflector refraction result shown in Fig skylight sodium lamp solar altitude space spectral power density spectrum sphere square SSSSS SSSSS SSSSS steradian surface Table temperature tion transmittance tristimulus tube tungsten unit values vertical visible voltage watts wave wavelength yields zone