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 280
tis desirable to light a large area. The intensive distribution isused for medium and average conditions where more than onelamp or outlet are required. The focusing distribution is usedwhere the lamps are placed comparatively high above thereference plane. PRINCIPLES OF INTERIOR ILLUMINATION 265… … Fig. 159.—Characteristic curves Mazda 100, 150, 250-watt, 100-125-volt, bowl-frosted lam^js with focusing reflectors. Table 41Relative Location of Lamps with Different Types of Reflectors. Curve Reflector Height above reference plane (feet) Distance between lamps (feet) DistanceHeight Number…
Light · Photometry · Electric lighting
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