Single 250 Watt MH with 2 36 watt PCs for a 70 gallon tall?

[Cryersen]

Hey Everyone,

I am wondering if a single 250 Watt MH with 2X36 watt PCs for a 70 gallon tall would be a wise choice? I am currently running 5x39 watt T5s and am not sure if I should stick with the T5s or buy a metal halide off of some guy here on MH. The tank is around 24 inches high, 36 inches wide, and 18 inches deep (front to back). Any thoughts?

Thanks,

Curt