I would go with 400W for 36" deep. Especially once you figure that hood will be hanging another 8 - 12 above your water. I don't know if 250 are going to punch all the way down there. I just got a dual 400W hamilton with 2X96W PCs from Darin over at captivereefs.com. I was nervous about photo acclimation, but my tank is doing really well. I have a 105G tank thats 24" from waterline to top of DSB
, but the fixture hangs another 8" above the tank. So I am about 32" total and the 400 watters are really making a difference. Best of luck.
Here's to swimmin with bowlegged women.
Reef with 30G Sump/Fuge Combo
-30G LTAnemonarium with mated porcelain crabs, 10 sexy shrimp, and 2 pink skunks all tied into the other 135G in my system.