I have a home-made UV exposure unit for PCBs which uses "black light" tubes and ordinary window glass. The tubes were bought from a surplus dealer - they look dark blue and I think they are the same sort of thing as is used in discos. It works fine for normal positive-resist PCBs, exposure about 10 minutes. Doesn't erase EPROMs though... >Clewer,Brian wrote: > >The tubes I am useing are replacement tubes for a PCB exposure box. I >am sure they are the correct tubes. > >Brian. -- David Waterhouse