Values of scalar illuminance are included in the IES Code for Interior Lighting for certain areas. There is evidence that cylindrical illuminance might be a better correlate with the impression of the brightness of an interior. Experimental work is discussed and reported that suggests that the geometric mean of vertical and horizontal illuminance is also a significant parameter when comparing observers' impressions of the equivalent brightness of objects. Some of the experiments described show that hemispherical illuminance is a very good correlate to the impression of the brightness of objects where a single direction of view is considered.
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References
1.
Steinmetz, C.P. ., Radiation, light and illumination, 227 (1909).
2.
Epaneshnikov, M.M., and Sidorova , T.N., Svetotekhnika, 11, 11 (1965).
3.
Lynes, J.A., Burt, W., Jackson, G.K., & Cuttle, C. ., Trans. Illum. Engng Soc. (London), 31, 65 (1966).
4.
Cuttle, C. ., Valentine, W.B., Lynes, J.A., & Burt, W., Proceedings of CIE Session, Washington, paper 67. 12, 471 (1967).
5.
Lynes, J. A., Suggested in a private communication.
