Brightness of colored self‐luminous displays

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Abstract
This article summarizes the work of TC‐1.4 of the CIE in its attempt to improve the measurement of the quantity of light. It has become apparent in recent years that there are a number of instances in which two lights that measure the same do not look equally bright or have the same effectiveness for vision. These inconsistencies stem directly from our definition of light, radiant power evaluated by V(Λ), the luminous efficiency function of the human eye. since under certain conditions the use of this function to evaluate spectral irradiance may be inappropriate. A number of examples of the incorrect use of V(Λ) are given and particular emphasis is placed upon the evaluation of self‐luminous colored displays. A variety of techniques for solving the problems is discussed.

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