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The Comparison of Sun Protection Factor Values with Different Light Sources
Author(s) -
Noda Toshiaki,
Kawada Akira,
Hiruma Masataro,
Ishibashi Akira,
Arai Seiichi
Publication year - 1992
Publication title -
the journal of dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 65
eISSN - 1346-8138
pISSN - 0385-2407
DOI - 10.1111/j.1346-8138.1992.tb03263.x
Subject(s) - sunlight , solar simulator , sun protection factor , fluorescent light , visible spectrum , environmental science , fluorescence , optics , physics , optoelectronics , medicine , dermatology , solar cell
Sun protection factors (SPFs) were evaluated with three light sources (sunlight, a xenon arc solar simulator, and fluorescent lamps) in indoor and outdoor studies. Two types of light, UV‐A+B and UV+Visible, were obtained from the solar simulator. The untanned backs of twenty‐four healthy male volunteers were used as test sites. A broad spectrum sunscreen containing SPF 6, according to the manufacturer, was used. The sunscreen tested was applied at 2 mg/cm 2 . The actual SPF values were 4.8 with sunlight, 6.0 with UV‐A+B, 4.9 with UV+Visible, and 11.8 with fluorescent lamps. There were no significant differences between the SPF values with sunlight and those with the solar simulator; the SPF value for fluorescent lamps was significantly higher. The SPF with UV‐A+B of the solar simulator was similar to that with sunlight; the use of this light served to reduce pain on tested subjects. Therefore, UV‐A+B from the solar simulator seems to be the most appropriate artificial light source for evaluating sunscreens.