Found an old HP scanner and decided to make a UV exposure unit out of it. Purchased 200 straw hat uv leds on ebay even though I only used 145 of them. I may even be able to use the scanners power supply board as it has 12 and 5 volts. Hopefully I can use the 12 to power the leds and the 5 to power an avr or pic timer circuit.
The only thing I haven't figured out is how to make some sort of diffuser.
Update: Upon further inspection it looks like the power supply wont work as the leds draw more current than the power supply puts out. At least from the 12 volt side.
Last couple of pictures are of the plexi I bought and sanded on both sides. It was then tapped to the underside of the scanners glass. I guess I'll find out how good it works when I finally use it.