I used simple 2X20W fluorescent striplamp fixtures and 360BL fluorescent tubes. These are readily available at big hardware outlets. You can also use regular Edison bases and spiral blacklight tubes, as noted above. These are available from the same places. There are two disadvantages to these boxes: the 360BL tubes (with filter) do not put out as much photographically effective light as unfiltered 360 lamps or unfiltered and un-phosphored high intensity discharge lamps; and they are area sources rather than point sources, which can affect sharpness in some cases. The spiral lamps may also have a warmup problem and not reach full output until a couple of minutes after being turned on. The time to full brightness varies with temperature, line voltage, and lamp construction so the output from each lamp can be irregular for several minutes. The tube type fluorescents are less troublesome but still may show some variation, especially at low temperatures. High intensity discharge lamps are excellent, but they also need a warmup period. Commercial frames generally have a special actinometer that measures the UV output and adjusts the exposure time accordingly. Discharge lamps also resemble point sources, which takes care of any sharpness problems.