Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 176
is necessary to express theluminous value. The fundamental requirement isa definite unit which shall alwaysmean one definite thing. This thelumen is and the candle-power is not.We have already indicated the manyvariations of candle-power there are inuse, the mean horizontal, mean spherical, * See… … Fig. 2.—lOO-watt clear Standard Tungsten Fig. 4.—lOO-watt Stereopticon Lamp. LightLamp. Light distribution of bare lamp, in distribution of bare lamp, in vertical plane, vertical plane. M M m /---J^ CANOLE POWEJJ t \/~~~Z-— [3-- /k\k SCr^ \^my \ / \^ / ^Tt;^: 8 >--Jcanole dowetj 1 \ / ~^^--^ /…
Lighting
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