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Derived Illumination Specifications.

The article presents a study which evaluated the Weston-Crouch system of computing illumination intensities for a specified maximum visual performance percentage. H.C. Weston studied the effect of the size of work and brightness contrast to formulate a method to derive the illumination intensity nee...

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Published in:Journal of Applied Psychology Vol. 35; no. 6; pp. 377 - 381
Main Author: Tinker, Miles A.
Format: Article
Published: American Psychological Association Dec51
Subjects:
Brightness perception
Visual perception testing
Lighting
Reading
Weston, H. C.
Crouch, C. L.
Online Access:View this record in EBSCOhost
Summary:The article presents a study which evaluated the Weston-Crouch system of computing illumination intensities for a specified maximum visual performance percentage. H.C. Weston studied the effect of the size of work and brightness contrast to formulate a method to derive the illumination intensity needed for a given percentage of maximum visual efficiency. C. L. Crouch expanded Weston's technique by using more definite formulation and devising a monogram for the computation. In the study, the illumination intensities needed for fastest reading of newsprint and book print were compared with the corresponding intensities derived from the computations.