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 322
In designing a light unit to give the desired distributionwliich has largest field of application, namely the distributionfrom ilf = 4, it will be preferable by far that the candle-powervalues at GO degrees and above, be less than those made properby the ideal curve, rather than that these ideal… … Fig. ISS.—Ilolopliane reflector for street lighting. exceed the glare limit. A per cent, variation from the idealcurve of four to one is, as has been pointed out, permissible.Even a moderate condition of glare, on the other hand, is veryundesirable. Practical considerations, therefore, will lead…
Light · Photometry · Electric lighting
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