The color-matching property of lamps was appraised by use of Wyszecki’s 12 gray object colors that are metameric with respect to CIE standard illuminant C and the CIE 1931 color-matching functions. The color-matching property of a test source was assessed in terms of its failure to preserve the metameric match between the 12 gray object colors. The purpose of this study is to investigate whether these 12 gray object colors are sufficiently representative of the infinite number of metameric grays that are conceivable with respect to the same conditions. By use of reconstituted spectral distributions of fluorescent lamps with different values of the general color-rendering index but with the same chromaticities as CIE standard source C, the failure to preserve the metameric match was analyzed for the infinite number of metameric grays. The effective radius RC of the computed confidence ellipsoid (a reasonable index of the color-matching property of a given test lamp derived in the present study) has an extremely high correlation with the color-matching property of the test lamp assessed by use of the 12 gray object colors. This confirms the effectiveness of Wyszecki’s 12 metameric gray object colors for appraising the color-matching property of light sources.
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