References
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- For reasons which seemed appropriate at the time, Judd was prevailed upon to reduce, in his flattery index, 1 his preferred color shifts to one fifth of the value called for by the experimental data. This brought the arithmetic of the flattery index into line with that of the color-rendering index (which is an index of similarity to daylight-coloration and not a good measure of preferred coloration), but unfortunately rendered the flattery index ineffectual. That is, differences in the value of flattery index of two illuminants are hardly distinguishable from differences in color-rendering index; in a sense, by this five-fold reduction the preference signal was lost in the noise of lamp differences.
- HaftH. H. and ThorntonW. A. “High performance fluorescent lamps”, Journal of the Illuminating Engineering Society, Vol. 2, October 1972, p. 29.
- ThorntonW. A. “The quality of white light”, Lighting Design and Application, Vol. 2, December 1972, p. 51.
- IES Subcommittee on Color Rendering, “Interim method of measuring and specifying color rendering of light sources”, Illuminating Engineering, Vol. 57, July 1962, p. 471. Commission Internationale de l'Eclairage(CIE), Report No. 13 (E-1.3.2), 1965, Bureau Central de la CIE, 4 Avenue du Recteur Poincare 75, Paris 16°, France.
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- CIE Committee TC 3.2, at its London Meeting in July 1973, settled on the term color-preference index rather than flattery index, and agreed to begin work on formulation of such an index.