For the LED cube project
3mm if you are restricted to a small space, 5mm if you don't care ablut space, but wnat decent lighting, and 10mm usually is not used, but if you want a big light to light up a big space, then 10mm is fine. I prefer 3mm.
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10mm rrrrrrrrruuuuuuuuuuuuuulllllllllleeeeeeee!!!!!!!!! (rule!)
It doesn't really make much difference. Personal preference, but the 5mm are a decent size and easy to handle.