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Abstract
Since the proposed index to rate the color rendering properties of light sources, there has been a desire on the part of many individuals, especially those concerned with marketing lamps, to put this on an absolute basis. This would allow all lamps to be rated on the same base line thus allowing, for example, the direct comparison of the color rendering properties of a warm white and a daylight lamp. In this paper a method of doing this is presented, followed by the reasons why this serves no useful purpose.