Here is another idea for consideration. On Ebay one can buy HID Xenon auto head light kits for around $30. The kits have 2 bulbs with 2 ballast but no reflector etc. With a little research I discovered these are not really Xenon arc lamps but Metal Halide lamps that include some Xenon. But in any case they should make plenty of UV especially if the UV filter shield is removed. So I am thinking with some sort of parabolic reflector it could make a nice collimated UV exposure source. The posting even shows a 30000K Pink/Violet bulb.