Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 258
Fig. 1.—New Diagram of Simple Circular Polar Curve depressed diametrically 45°. Rectified by 45° zones. … Fig. 2.--The same Polar Curve rectified by20° zones. 244 THE ILLUMINATING ENGINEER (may) flux in candle-lumens. If the polarintensities are scaled in hefners, then2-r Q Q1 will be the total luminous fluxin hefner-lumens. Further, the total fluxin the upper hemisphere will be 2t QHlumens, and the…
Lighting
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