Abstract
The IES Roadway Lighting Committee sought to establish a criterion that might be used when choosing between high pressure and low pressure sodium lights. The quality of the optical image on the retina was a major consideration. The author, then serving on the IERI Technical Advisory Committee on Light and Vision, volunteered to apply to these two light sources a method that he had developed for assessing image quality in such cases. The method can also be applied to other types of light sources.
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