Design

All the measures are in millimeters. The last two pictures are hand-drawn schematics.

Materials

The box is a modified scanner. This is one of the best solutions because a great part of the work is already done, it looks much more clean and professional, the glass is already placed, and there is a cover useful for pressing the board against the footprint.

I'm using white fluorescent tubes, not ultraviolet ones. Fluorescent tubes are usually connected to magnetic ballasts but I bought the more efficient electronic ballasts. Excluding the scanner the total cost was 28€.

Scanner disassemble

Aluminium sockets

Aluminium sockets used for fixing the fluorescent tubes to the wood panel and being powered.

Wood panel

All the sockets are screwed to a wood panel covered by a few layers of paper which reflects light in a uniform way.

Putting all together

The electronic ballasts are placed under the wood panel, which is screwed to the scanner and rests on top of some wood pieces.

Finished lightbox

It just needs to be connected to a 220VAC plug, place a footprint under a phosentitive board and cover it.