Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 28
We havethe illumination values measured byLumens per square foot. As each Lumencorresponds to one foot candle persquare foot, the term foot candles persquare foot per watt (the expression forefficiency of illumination) becomes moresimply Lumens per watt. We alsohave the efficiency of the lamp… … Fig. 7.—Ideal Curves, showing same totallight flux. Each curve expresses equalilluminating value (the same total lumens)hut apparently very dittereiit candlepowervalues. ViG. g.—Diagram showing how. in an ex-treme case, the same total light flux may bedistributed so as to show very…
Lighting
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