title: Reciprocity for solar simulators used in sunscreen testing.
abstract: 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.
authors.affiliation: Clinical and Toxicology, Shering-Plough, Memphis, Tennessee 38151.
authors.forename: R M
authors.initials: RM
authors.lastname: Sayre
authors.forename: K H
authors.initials: KH
authors.lastname: Kaidbey
mesh_terms: D000293:Adolescent; D000328:Adult; D004307:Dose-Response Relationship, Radiation; D004890:Erythema / Q000209:etiology; D006801:Humans; D006968:Hypersensitivity, Delayed; D012867:Skin / Q000528:radiation effects*; D013471:Sunburn / Q000517:prevention & control*; D013473:Sunscreening Agents / Q000528:radiation effects* / Q000592:standards; D014466:Ultraviolet Rays / Q000009:adverse effects*
chemical_list: D013473:Sunscreening Agents