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Abstract
The performance of the flat plate or cosine type incident light receptor is compared with that of the hemispherical or cardioid type, and values are suggested for the photographic constants when these two types of receptor are used. After an introductory description of the techniques of exposure determination the difference in performance of the two types of incident light receptor are deduced by consideration of their angular response characteristics in relation to particular lighting conditions. Experimental evidence is given in support of the theoretical considerations.