• To determine the equivalence of xenon 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 shown to be equivalent on unprotected 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' environment, natural sunlight effects can be duplicated with a solar simulator.
(Arch Dermatol 114:1649-1651, 1978)
Sayre RM, Desrochers DL, Marlowe E, Urbach F. The Correlation of Indoor Solar Simulator and Natural SunlightTesting of a Sunscreen Preparation. Arch Dermatol. 1978;114(11):1649-1651. doi:10.1001/archderm.1978.01640230023007