Abstract

The recording spectroradiometer for collecting data on the spectral distribution of daylight at Delhi is briefly described. The chromaticities calculated on the 1931 CIE system from 187 spectral curves, recorded over about a year, are presented and their distribution about the Planckian locus is discussed. The typical spectral distributions for the correlated color temperatures 4800, 5500, 6500, 7500, and 10 000°K, derived from the characteristic vectors are presented and discussed.

© 1968 Optical Society of America

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