Luckiesh, Matthew, 1883-1967 · New York, D. Van Nostrand company · leaf 260
232 COLOR AND ITS APPLICATIONS tiplying the mean luminosity curve of the eye (Fig. 93) for equal amounts of energy of all wave-lengths by the amounts of energy of various wave-lengths in the spectrum of the light under consideration. In this case it is the 7.9 lumens per watt tungsten lamp whose… … Fig. 102. — Showing the loss of light when using the ideal artificial- daylight screens with the tungsten lamp operating at 22 lumens per watt. areas under curve Ex and a' are proportional to total luminous sensations, and the ratio of the area of a' to that of El represents the skylight efficiency…
Color
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
