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OF LIGHT AND LIGHTING
Photometric Laboratory Measurements
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approximately average aiming angle Beam Lumens Beam Spot blue brightness calculated candle candlepower distribution curve candlepower values ceiling cell cent Coefficient of Utilization color grading color temperature colors of light cosine Coverage Factor daylight deluxe cool white diffuse reflection direct downlighting effective lumens efficiency electric energy equal example feet filament lamp floodlights fluorescent lamps Flux Ratio footcandle level footlamberts glare Home-line Illuminating Engineering inches incident light indirect C.U. instrument interiors inverse square law Lambert's cosine law Lamp Lumens lens light meter light source lighting system Lumen Method Lumens per foot lumi luminaire luminous luminous flux materials measured multiplied naires photometer plane produce rays reading reflection factor reflector Room Ratio rows shown in Fig spacing spectral specular specular reflection sphere Spot Area steradian surface tion TOTAL LAMP transmission factor transmitted ultraviolet utilization factor vertical visually comfortable wall warm white wavelength yellow zone