Hi, I've recently bought a windowed 16c62a. But with my mother's face solarium it takes 3 hours to empty the PIC. I've mounted the PIC against one of the four tubes which are 8 watt types. Why does this takes so long? Not the right wavelength? Or because the UV-A and the UV-B are filtered out? In the catalogus of Conrad (only in Holland and Germany) they sell 12volt 4 watt tubes for almost 20 dollars! A normal solarium type (8w) is only 11 dollars. why this great difference in pricing? Greetz Radboud Verberne PE1RUH