William A. Thornton

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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(More)
A companion article introduced a set of orthonormal opponent color matching functions. That " orthonormal basis " is an expedient for plotting lights in Jozef Cohen's logical color space. Indeed, graphing the new color matching functions (CMFs) together (as a parametric plot) gives Cohen's invariant " locus of unit monochromats, " or LUM. In this article,(More)
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