Homebrew PCBs

I'd like to build a UV box to do positive resist exposure. The 
presensitized boards are 5 by 7 inches, so the box and lamps need not 
be too large. Also not too hot as this box is only open on the bottom. 
LED's are under consideration but so far a pre-made PC board to hold 
400 or so is too expensive. The board is nothing more than etched 
parallel lines with drilled holes every .1 inch. UV lamps are a second 
choice but they tend to fade and burn out over time.
What are your recommendations?
Terry M