Abstract

Evaluation of color-rendering capability of commercial lamps is considered from the point of view of the lampmaker and the typical user, rather than for precision color-matching applications. Only an approximate magnitude of color-rendering capability of a test lamp has meaning for the average user. Only illuminants of superb color-rendering capability are used here as reference illuminants. Such ideal reference illuminants are defined for a range of colors, both on and off the blackbody line. Chromatic adaptation approximates object-color constancy adequately closely as long as both initial and final illuminants have color-rendering capability approximately as good as that of a daylightlike illuminant. These considerations lead to more universal reference illuminants and allow usefully valid comparison of lamps of different colors with acceptable accuracy.

© 1972 Optical Society of America

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