Reciprocity for solar simulators used in sunscreen testing.

Photodermatol Photoimmunol Photomed

Clinical and Toxicology, Shering-Plough, Memphis, Tennessee 38151.

Published: October 1990

Reciprocity for sunscreen solar protection factors (SPFs) and for delayed erythema was examined using a solar simulator equipped with neutral density filters to vary the beam intensity. Similar SPFs were obtained over a 15-fold intensity difference, using a sunscreen with a low (SPF-4) and a high (SPF-15) protection factor. Reciprocity was also observed for delayed erythema in unprotected skin.

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