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Physics of Light
Light and Vision
Measurement of Light and Other
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angle arc tube average ballast beam brightness bulb candelas candlepower Cavity Ratio ceiling cent characteristics circuit coefficients color temperature contrast curve daylight diffuse direct distribution effect electrical energy factor feet floodlights floor fluorescent lamps flux footcandles footlamberts glare glass heat high-intensity discharge lamps horizontal Ilium illumination levels incandescent filament installation intensity Lamp Lumens Length inches level of illumination light output light source lighting equipment lighting system located louvers lumens lumi luminaires luminance luminous efficacy luminous flux material maximum measured ment mercury lamps metal metal halide lamps method minimum mounting height nanometers normal operation photometric photopic vision radiant flux radiation rated recommended reflector roadway runway S.C. Bay Section shown in Fig space specific spectral specular standard surface tion tube typical units usually values veiling reflections vertical visibility visual performance visual task voltage wall wattage watts wavelength