Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 178
Fig. 6.—Ideal curves, showing same total lightfluxin various forms of light distribution.(Note the apparent large increase in lowercircle as compared with the other curves.) Fig. 8.—Variation in apparent candle-powervalues of a 300-watt lamp through use ofdifferent reflectors. … Fig. 7.—Diagram showing how, in an extremecase, same total light flux may be distri-buted so as to show very misleading valuesof apparent candle-power. Notwithstand-ing its far greater area, the flux of lightrepresented by the large curve (1) is thesame as that represented by the threevery small…
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
