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#1
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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#2
02-07-2012, 11:22 PM
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I think the reason for over heating my array is because I placed 22 LED running at 700ma in a U shaped aluminum of 34" length.witch gives me a gap of aprox 1.4" between each LED.
I just placed another U shaped aluminum on the back side (with heat transfer grease) and turn the array on so far 15 minutes passed and its running warm that maybe the answer as more surface area for heat dissipation 
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