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#10
02-07-2012, 02:43 PM
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I run that type of U channel no problem with 3w leds run 2" apart. They are barely warm to the touch, no fans. I mount them so the fins are facing up though I think that would make a difference. I also paint them with a high high flat black paint. My research indicated that a painted heat sink has better heat dissipating properties (emissivity).
I definitely would have went with a larger awg wire.....for the small cost it's a nice piece of mind. Last edited by reefermadness; 02-07-2012 at 02:46 PM. 
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