Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 228
e lamp and fitting-used is given in Fig. 27, and from this themean hemispherical candle-power is 3.680.The total light flux per point availableunder the best possible conditions is3680x2*-= 23100 lumens. The approximate estimate of the meanhorizontal illumination, taking these factsinto… … FIG. 26 PLAN AHD ELEVATION OF ENGINEERS SHOP DIRECTLY LIT BYPLANE ARC LAMPS The floor area is 67,200 square feet, sothat if it were cleared of all obstructions.and all the light from the 36 lamps hadbeen directed on to it, the mean hori-zontal illumination would have been Table XIII. 23100x3667200…
Lighting
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