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Light and Vision
Standards and Nomenclature
Measurement of Light and Other
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aluminum angle applications average ballast beam brightness bulb candlepower cathode Cavity ceiling cent characteristics circuit color temperature curve daylight diffuse direct distribution effect efficiency Electric factor feet filament lamps fixtures floodlights fluorescent lamps flux footcandles footlamberts glass heat horizontal Ilium illumination levels incandescent filament lamps incandescent lamps industrial inside frosted installation interior Length inches lens level of illumination light output light source lighting equipment lighting system located louver lumens lumi luminaires luminance luminous efficiency maintenance materials maximum measured ment mercury lamps metal method minimum mounting height nanometers normal operation panels photometric plane plastic produce radiant energy radiation rated ratio recommended reflector screen Section shielding shown in Fig space specific spectral specular standard surface tion tube tungsten typical ultraviolet units utilization values vertical visible visual task voltage volts wall watt wattage wavelength window