2 X 150 HQI & 4X54 watt T5 sufficient output for a 120 Gallon

[xxxbadfishxxx]

2 X 150 HQI & 4X54 watt T5 sufficient output for a 120 Gallon Mixed Reef (48X24X24)? Reef will be predominatly Soft & LPS, but will also have some SPS and Clams. SPS would most likely be Monti Caps and some begginer SPS.

Not only are the 150 fixtures cheaper, but i figured that they would heat the water less and use less electricity. I am currently a T5 user, and when i upgrade i was set on going 100% T5's again, but i got to admit i am jealous of the ShImMeR.

On some websites they say the above mentioned combo would be significant for a 90 gallon, but the 120 is the same just 6 inches wider (front to back), doesnt a MH Bulb have a 2X2 footprint?

Just looking for some advice and for some people that run this kind of fixture on a 120.