If you read a few pages back, epicfail has a box 2'x4' with 8 cxa3070 @ 700 to 1050mA, it gives max 40? watts/sqf.
I'm thinking on doing the same thing but divided in 2 times 2'x2' (12/12 flip-flop) to level out heat (warm the non lighted area) with the same 2 drivers , but am worried about...