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alternating current amount amperes angle anode arc lamps artificial light atoms beam black body brightness bulb burner candle candlepower carbon arc cathode ceiling cent circuits color color temperature crater daylight desirable diffusing direction disk distance distribution effect efficiency electric electrons emissivity equipment factor feet filament fixtures flame arc foot-candles gas-filled lamps given glare glass greater heat horizontal illumination incandescent lamps increase installation intensity ionization lens light source lighting units lumens luminous efficiency luminous flux luminous intensity mantle material maximum measured mercury mercury-vapor lamp mirror normal objects obtained operation ordinary photometer photometer-head positive produce radiation rays reflection reflector relative retina screen semi-indirect shadows signal skylight space spectrum specular reflection standard street surface Table temperature tion tube tungsten lamps usually values vapor vertical visible visible spectrum vision voltage volts walls wattage watts wave-lengths wire