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absorbed acetylene acuity angle of incidence artificial light beam of light black body brightness buildings bulb candle candlepower per square cent circuit color dark daylight desirable determine diameter diffuse reflection direct disk distance distribution curve effect efficiency electric electroliers filament flame foot-candles glare glass greater hence illumination intensity illuminometer incandescent lamp increase indirect lighting indirect system installation intensity of illumination intrinsic brilliancy Lambert's cosine law lens light flux light source lighting system luminaire luminous flux mantle Mazda B lamp natural light number of lumens object obtained photometer placed plane produce radiation readings reflection factor reflectometer reflector retina screen shade shadows shown in Fig side source of light spectrum sphere spherical standard street lighting sunlight tantalum temperature tion Trans tube tungsten uniformity varies vertical vision voltage voltmeter walls and ceiling wattage wave length Welsbach mantle wire