I had 2 of these PFO parallel reflectors over each of my 75s with a couple of 250w mh and 2 4' T5's in them.
I ended up never running the MH since everything including clams and SPS were thriving under just the 2 T5 bulbs overdriven by an IceCap660 ballast. I have since sold them off and bought 4 IceCap SLR reflectors for each tank and run 4 overdriven T5's on each 75g.
Here's a shot of my setup before going all T5.
