Mine uses 96 UV LED's (the cheap ebay variety) on a 15mm grid. Exposure is about 45-60 seconds at 6" using negative resist film. There is no need for foil. etc. as a reflector, just make sure your distance is great enough to even out the illumination. Eddie DJ Delorie wrote: > > I use UV LEDs for my exposure box - 100 of them, on about a 1" grid, 20 > mA, about 5" from the PCB. Takes about 5-6 minutes to expose. > >
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Re: [Homebrew_PCBs] Home Made UV Exposure Box
2010-04-01 by Eddie Stassen