On 26/07/2011 21:40, adastra wrote: > My intuition is that it would take a lot of lEDs to get that level of eve= n > illumination, but the truth is, I haven't tried to work this out yet. I > guess it's time. Maybe go for 30 x 0.5W rather than 15 x 1W LEDs? Either is doable evenly I think, and I would assume that about 15W of=20 LEDs might be enough. Russell would have a better idea 3.5" is not a bad depth even for some natural spread of the LED=20 illumination from inbuilt lens --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .