I was going to make the same point that Don Smith has, but he beat me to it. The "new era" lamps such as 9k90, Sig HP's & Sol Glass type lamps have a much lower UVB percent, however that % is lower in the spectrum, closer to the UVC spectrum. So the little UVB there is usually acts much stronger. Also there is much lower UVAČ & much higher UVAč. Looks like the Sol Glass lamps may be the ideal lamp for such applications.