Cheap UV focusing light

[otoien]

That was an interesting link Andrea. I particularly liked that part where he blocks all the otherwise visible violet color from the filtered convoy with UV safety glasses. I observed the same with my ZWB1 filtered Tank007 TK-566. He also mentions using a UV filter for a camera on the light in one of his tests (to only look for light leakage), but I found that my Nikon L39 would only attenuate fluorescence of a white sheet of paper to about 1/4 when shining the light through the filter (as judged by eye).