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Related to UV-A: UV index
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where S and E are the ratios of the test over calibration source for the total signal measured and the actual UV-A light from the sources, respectively.
This is because the in-band response does not match the ideal UV-A response function well.
Though long UV produces DNA damage with only perhaps 1/1,000 the efficiency of mid-range UV-B, he points out that UV-A penetrates light-colored skin more deeply than UV-B does.