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Light and Vision
Standards Nomenclature Abbreviations and Symbols
The Measurement of Light
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ampere angle angle of incidence approximately average ballast base beam brightness ratios bulb candlepower ceiling cent characteristics circuit color temperature Colorimetry curve daylight degrees diameter diffuse direct distance distribution effect efficiency electrical energy F F G factor feet field of view floodlights floor fluorescent lamps flux footcandles footlamberts glare glass horizontal Ilium illumination level incandescent filament lamps inside frosted installations interior light output light source lighting equipment located louvers lumens luminaires luminous luminous intensity maintenance maximum measurements medium mercury method millimicrons mounting height Munsell operation Optical Soc photometric plane radiant flux radiation rated recommended reflectance reflector roadway shown in Fig spacing spectral Spectrophotometer specular specular reflection standard surface Table tion Trans transmitted tube tungsten typical uniform units utilization values vertical visibility visual task voltage volts wall wattage wattmeter watts wavelength window