Why'd u decide on the cxa3070? This thread is pretty old, but if u haven't looked into it yet, check out citizen COBS, I've had great results with clu048 sofar. I run 6 1818s in a 4x2, and it's more than enough light, 320 Watts. In a 5x5 id prolly do like 20 1212s at 700ma, i think that's about...