Abstract

Twelve commonly used fluorescent paints were measured visually on a six-primary Donaldson colorimeter while being irradiated in turn by natural daylight from a north sky and artificial daylight—represented by Source C and by a high-pressure xenon arc. The results show that, for the most part, the xenon arc gives a better rendition of the samples than Source C as compared with natural daylight of the same correlated color temperature. However, the luminance factors of the samples obtained with the xenon arc are consistently higher than those obtained with equivalent natural daylight. In this respect Source C has a better agreement with natural daylight. Different fluorescent samples show different effects under the various sources of daylight. Deep red, orange, and pure yellow samples are only affected slightly by changing from one source to another. The chromaticity coordinates of the magenta, blue, and white samples depend strongly upon the source, and the ultraviolet content of the spectrum of the source often plays an important part in determining the chromaticity coordinates and luminance factors of these samples.

© 1963 Optical Society of America

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