Sun simulators are available in different classes indicating the performance characteristics by the combination of three letters (A,B or C) (according to IEC 60904, JIS 8912 and ASTM E 927-05). Each letter represents respectively the spectral match with the solar spectrum (1000 W/m2, AM 1.5), uniformity of the light field and temporary stability. Class AAA are considered as most accurate and have an ideal spectral match between 0.75 and 1.25, max. 2.0% non-uniformity and 0.5% nonstability according to the IEC standard. The ideal spectral match is divided in spectral bands. Those represent a certain energy quanta of the total spectrum allowing a 25% variance in that particular range.
By EKO Instruments based in San Jose, CALIFORNIA (USA).
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