I have a 7 by 7 grow area to work with. I'm thinking either 2 thousand(short by 450) watts, 8 250 watts(short by 450), or 3 or 4 600 watts...( @3 short 650... @ 4 short by 50) What do you think would be the best?? 4 if this was the only option i had, 3 1k's is what is do if i could swing it with...