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System of mesopic photometry for evaluating lights in terms of comparative brightness relationships

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Abstract

A photometric system assessing lights in the mesopic range in terms of comparative brightness relationships is described. The system is based on a weighted geometric mean of the CIE photopic luminance modified by the brightness-to-luminance ratio (B/L) and the CIE scotopic luminance to provide an equivalent luminance that corresponds to comparative brightness relationships of lights in the mesopic range. The weighting coefficient, called the adaptation coefficient, is defined as a function of equivalent luminance, so an iterative calculation is required to obtain an appropriate equivalent luminance. Examples of how to calculate the equivalent luminance and an experimental evaluation of the system are described.

© 1992 Optical Society of America

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