I separated my LED strips by the same distance as between each LED on the strip - about 1cm if i recall. I'm sure a math person could tell me reasons why this is not the best, but it gives me a very even light. No spotting or banding that i can detect. They are about 3 inches above the glass of my print frame. Like baking cookies, i rotate the print 1/2 way through for even browning.
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