Light, photometry and illumination : a thoroughly rev. ed. of ''Electrical illuminating engineering'' (1912)
Barrows, William Edward, 1878-1960 · New York ; London : McGraw-Hill Book Co. · leaf 275
heightof the light center is kept constant. If now we let mean dimension of roomheight of light center above reference planethen for any value of J there is a given distribution curve whichwill produce the desired distribution of illumination. 260 LIGHT, PHOTOMETRY AND ILLUMINATION Small Rooms.—For… … 10 864 202 4 0 Floor Line Fig. 153.—Desirable distribution of illumination in a room. 80 Apparent Candle-power120 160 200 240 280 320 330 400
Light · Photometry · Electric lighting
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