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Well, in the past few month i have been interested in a different part of Sunlight.photography...wawelenght 260 -300 nm...forensic photos,
and had to prepare my equipment for this, as follows...
Step 1Source
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The source of UV light can be normal bulb but with Woods-glass, fluorescent bulb with the same glass, and UV led-s. The first two use high Voltage, which was inconvenienced for my needs, so I purchased on E-bay UV led-s 260-400nm.
More on UV, phosphorescence and photography you can find on Web.
This UV led's has to be mounted in a waterproof housing ...
What type film are you using? With that much light you should not have to do long exposures.
I just spotted your "UV light photography II" which looks like it solved your problem. ;-D