I'll be honest, I haven't been following the big DIY LED thread for some time, but I can honestly say that there is no right way. The tighter you cluster the LED's, you going to get a hot spot in you lighting. If you looking for broad even lighting, spread them evenly across the tank. You can also really change up the intensity of your lighting by using optics.
Personally on my 180g tank, I used 4 10" x 10" heatsinks, and am loving it so far. I used all cool white and royal blue LED's and it just seemed that there was something missing. Just today I added in some warm white LED's and lets just say it was a move in the right direction. I'm sure I'll continue to tweak and tune the colors, but I'm definitely glad I went with LED's.
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NorthWest Ohio Reef Association
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