The correlation of indoor solar simulator and natural sunlight: testing of a sunscreen preparation

Abstract

To determine the equivalence of Xe arc solar simulator and natural sunlight test results, the sun protection factor (SPF) for an experimental sunscreen preparation was determined using each light source. The minimal erythemal doses (MEDs) were equivalent on unprotected [human] skin. It was necessary to supply additional heat to the treated skin prior to solar simulator exposures to obtain comparable SPFs. By careful control of the subjects''s environment, natural sunlight effects can be duplicated with a solar simulator.