chapter  42
10 Pages

Spectral Standardization of Sources Used for Sunscreen Testing: 5 Years of Compliance

Introduction 843

Methods 845

Instrumentation 845

Calibration Procedures 845

Measurement Procedures 845

Measurement Uncertainty 846

Results 846

Discussion 848

Conclusion 850

References 851


In 1978, the US FDA published a report and monograph on sunscreen product

testing and labeling (1). This monograph established that a solar simulator

would be a source having a continuous emission spectrum from 290 to 400 nm

and be filtered for a solar zenith angle of 108 and have less than 1% of its

energy contributed by wavelengths shorter than 290 nm. In addition, to avoid

purported thermal problems, they also required that the solar simulator could

not have more than 5% of its energy contributed by wavelengths longer than

400 nm. The beam uniformity is required to be within 10%. Specifically, latter

monographs have recommended that a solar simulator requires periodic

remeasurement with a calibrated spectroradiometer to insure the proper spectral

distribution (2-4).