Light Energy and Brightness Sensation

IN his recent communication1, Hopkinson suggests that the relationship between M, the magnitude of brightness sensations, and L, the corresponding physical luminance, is M = kL0.3 for dark-adaptation conditions; and M = kL for light-adaptation conditions.

[1]  K. J. Craik.  The effect of adaptation on differential brightness discrimination , 1938, The Journal of physiology.

[2]  K. J. W. Craik,et al.  The effect of adaptation on subjective brightness , 1940, Proceedings of the Royal Society of London. Series B - Biological Sciences.

[3]  R. W. G. Hunt.  Characteristic Curves of the Human Eye , 1953 .

[4]  J. L. B. Smith.  Pugnacity of Marlins and Swordfish , 1956, Nature.