Now that we know which bulbs to use, how about the construction of the box? A friend and I just went in on purchasing 6 bulbs at 27 watts each. We figure this will adequately cover 8x10 on an 11x14 sheet of paper.

Are you guys building complete enclosed units? If so, how are you extracting the heat from the bulbs? Or is that a concern over a, say, 10min exposure?

Or are you guys building your boxes with at least one side open? If so, what, if any, concerns do you have for UV light spillage?