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To establish trends in surface ultraviolet radiation levels, accurate and stable long-term measurements are required. The accuracy level of today's measurements has become high enough to notice even smaller effects that influence instrument sensitivity. Laboratory measurements of the sensitivity of the entrance optics have shown a decrease of as much as 0.07-0.1%͞deg temperature increase. Since the entrance optics can heat to greater than 45°C in Dutch summers, corrections are necessary. Adoi:10.1364/ao.46.004222 pmid:17579677 fatcat:ovuud7j5evgkffdb747ovxzw5q