Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 178
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… … Fig. 9.- -Diagram illustrating the nature of thelumen. o2 172 THE ILLUMINATING ENGINEER ^april) The same point is shown in Figs. 7 and 8,where the same total light flux (lumens)is altered by the use of reflectors to givevery misleading apparent candle-powervalues. These diagrams are…
Lighting
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