Abstract
Two major factors determine the visibility of common objects: the luminance contrast of the object detail with respect to its immediate background and the adaptation level of the visual system. CIE Publication No. 19 chooses the term task luminance to characterize an observer's state of adaptation and then uses this factor to describe a task in connection with all operations carried out in the visual performance framework of methods. The imprecision and poor understanding of this parameter severely restrict the accuracy of the visual performance methodology in lighting energy conservation and design. Experimental procedures are proposed for accurate measurement of background luminance for typical office and school tasks.
Published Version
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