This is the layout for an exposure system based on UV LEDs. Be sure to use the wider angle LEDs (30 degrees). I offset a piece of glass about 1-2 inches from the surface when exposing. I am also using a frosted shower glass over the LEDs. You can delete some of these for a smaller system. This one uses 180 LEDs. There are about 3V per LED so you need at least 18V to make this work. Adjust the resistors so that you have the correct current per LED (~30 mA). A 1 amp supply should work for this. I mounted mine in a picture box from Michael's.
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