I attended a super workshop on Pt/Pd printing which was run by photographer Ian Leake and Ian has a UV box which uses 8 - tubes at a distance of about 6" from the printing frame and they work really well. I went for BC fitting UV lamps because it is easier for me to switch from them to an ordinary tungstan lamp for contact printing with the new silver chloride paper, Lodima. Even 1 - 25W UV lamp was way too fast for this paper.