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Related Experiment Videos

Sunscreen standards tested with differently filtered solar simulators.

R M Sayre1, J Stanfield, A J Bush

  • 1Rapid Precision Testing Laboratories, Cordova, TN 38018, USA. rptl@aol.com

Photodermatology, Photoimmunology & Photomedicine
|November 28, 2001
PubMed
Summary
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Solar simulator spectral filtration significantly impacts sunscreen SPF testing. Differences in UVB and UVA-1 output can lead to nearly 50% variations in measured Sun Protection Factor (SPF) values.

Area of Science:

  • Dermatology
  • Photobiology
  • Cosmetic Science

Background:

  • The COLIPA standard allows spectral filtration variability in solar simulators.
  • Previous studies show >50% SPF variation between labs for sunscreen standards.
  • No studies have investigated SPF performance differences due to COLIPA-compliant spectral variations.

Purpose of the Study:

  • To investigate the impact of varying solar simulator spectra on sunscreen SPF.
  • To determine if spectral differences within COLIPA standards affect SPF measurements.
  • To assess potential reciprocity failure in SPF testing.

Main Methods:

  • A paired clinical trial tested two standard sunscreen formulas.
  • Two COLIPA-compliant solar simulators with different spectral filtration were used.

Related Experiment Videos

  • One simulator had standard filtration (high UVB); the other had visible filter removed (enhanced UVA-1, lower UVB).

    • Main Results:

    • SPF values were nearly 50% higher with the unmodified (high UVB) simulator compared to the modified (enhanced UVA-1) one.
    • In vitro tests predicted similar SPF differences, suggesting spectral effects, not reciprocity failure.
    • Reciprocity failure was observed for the control Minimal Erythemal Dose (MEDs).
    • The modified lamp's total intensity was approximately three times that of the unmodified lamp.

    Conclusions:

    • Solar simulator spectral filtration significantly influences sunscreen SPF results.
    • Variations in spectral output, even within COLIPA standards, can cause substantial SPF discrepancies.
    • Further investigation into spectral effects and reciprocity failure is warranted for accurate SPF standardization.