Blur of the Retinal Image of an Object Illuminated by Low Pressure and High Pressure Sodium Lamps

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.