How many watts per gallon?

How many watt's per gallon is good to have good growth of SPS and LPS?

I just bought a new light fixture and it is 716 Watt's. I have a 72 Gallon tank. I am calculating 10 watts per gallon. My old PC setup was 260 watt's and calculated 3.6 watt's per gallon. Is this going to be good?

My new fixture will have 4 54W T5 460 actinic and 2 250W 15K metal halides. Do you think should change out 2 for the T5's for another spectrum? On the HQI lights should i change to 10K for better growth?

Pjracer

Heres my new lights.
48" Metal Halide T5 Light Saltwater Aquarium 716W 2x250 - eBay (item 300451215176 end time Aug-29-10 07:18:30 PDT)

 

You should be able fry whatever you want in there. Watts per gallon was measured for T NO and VHO bulbs.

 

uh oh. what do you mean by fry? Now im afraid.

 

That is a lot of light. You will need to provide LPS and softies shade for them to keep their colors.

 

OK so the SPS and montipora's good but zoas and other softies toward's the bottom.

How high off the water do you think it should be?

 

At least 8" for the MH, the T5 can lower id the setup allows.

 

lmao!