Using Jean-Bernard Roux's article on building a UV exposure unit as a starting point, and along with Sandy King's various contributions, I've been planning the construction of a UV exposure box. My intention is to use twelve 24" black light blue fluorescent tubes installed in close proximity to each other. In Jean-Bernard Roux's article he places the ballasts and wiring etc. on the other side of the board to the tubes, which seems a sensible option. I managed to find separate 'T8' tube sockets and 2 x 18W ballasts which should reduce any excess unit size. My plan is to paint the inside of the plywood white and varnish the outside. Ballast: http://www.screwfix.com/prods/66598...ram-Quicktronic-Professional-T8-Tube-2-x-18W# 'T8' tube sockets: http://www.firstlightdirect.com/scp...lasts_End_Caps/Fluorescent_Tube_End_Caps.html Wiring the ballasts to the tubes is done in something approximating my following diagram as far as I'm aware: This would be repeated six times to cover all twelve tubes. Maplin sell this fan (120mm model): http://www.maplin.co.uk/Module.aspx?ModuleNo=1810 which looks suitable for cooling purposes. French article: http://www.galerie-photo.com/construire-insoleuse-uv-photographie_roux.html I was planning on the black light blue tubes being situated approx. 120mm from the print surface / contact printing glass, is this a sensible distance? Tom.