I was digging in a shed a couple days ago and found a box of 6 brand new light fixtures for U-shaped florescent (sp) bulbs. Obviously I wont be using these types of bulbs in a contact printer, and since they are free I wont to just re-purpose the ballasts. Right now each fixture is set up for one bulb. I assume that means I use one bulb per ballast. I might be wrong though and can get two bulbs per ballast, or these are useless for what I want to do. Would anyone be able to give me some advice. I also need a quick yes or no about MDF. Can a person use MDF in an exposure box? All of this, as well as the electrical wire is found material and therefore I could make an exposure box for the cost of bulbs and elbow grease. Works for me.