I built a box from 10x "GE 22 in. Black Plug-In Fluorescent Light" from the local DIY store. Built a box out of a plywood backing and 1x8 sides, wired the lights up to a couple of switches that turn on every other lamp (in case I want less light, which has never happened so far). Eventually I bought a piece of 27" square 1/4" thick glass to put over the top of the box (my vacuum frame fits over the box, and I just flip it upside-down while exposing, so this was just a nice addition after the fact).

Works fine. Fancy designs optional.