When a narrow‐band source is compared to a white source, through a simultaneous brightness match, the equibrightness condition does not necessarily imply that the luminances of the two sources coincide. This known fact is now checked by using as sources red and green light‐emitting diodes (LEDs), compared to CIE source A. In addition, we check some predictions concerning the influence of saturation, wavelength dependence, and small‐field effects. Some problems related to eye‐lens accommodation are attacked by taking into account the chromatic aberration of the eye and the unpredictable role of psychological factors in determining the wavelength focused on the retina. Their influence on the brightness‐luminance ratio is quantified.
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