Here are photos of the latest version of the adjustable light box for reed / slot work.
It now uses an LED light bulb with a dimmer switch. I also built in a compartment for the wax / oil lubrication for the embossing tool, and a magnet to hold the reed wrench / lifter handy. The translucent panel for sighting reeds with a back light swaps out with the wood panel that has the slot. The work surface is mounted on a 3 inch pipe section that allows you to rotate it for your line of sight. It also has the clear cube with hairlines on it that allow you to check to make sure your eye is centered while you work.