90 Gallon Light upgrade Question

I am looking to upgrade my lighting setup. I love my 2x250 watt halide with 14k phoenix bulbs. But the heat and power is killing me. It's pulling almost 600 watts (kill-a-watt meter)
I just bought a Wavepoint 4x24 watt T5HO for my 29ish bowfront tank and I love the colors I get with it!! (ATI Blue special, ATI blue plus, ATI ProColor, ATI Blue plus)
My Xenia and rose anemone are just a beautiful color with a tank that looks about 15k or so.

I was wanted to grab a T5HO fixture for my 90 gallon mixed reef: SPS to softies.
I was thinking either a 6x54 watt or a 8x54 watt fixture. Either ATI or Sunlight Supply Tek Elite. Wondering what your thought were on this and could advise.
I read somewhere that T5HO has more lumens per watt than halides. Does anyone know by how much?

 

Lumens are a measure that did not properly apply to water applications. PAR does. A 6 X54 unit in the ones you are looking at will be about the same to a little weaker than your MH set up the 8 X 54 will be stronger. The ATI will put out about 10% more than the Tek Elite. Purchase from ReefGeek > Aquarium Supplies for Marine, Reef, and Saltwater Aquariums, they have the best prices and possibly service also.

Welcome to 3reef.

 

Nice, that was exactally what I was looking for.
So ATI fixtures really are better than anything else out there?
I briefly read somewhere that someone with a powermodule was able to dim the T5ho's. Is that true?

 

upgrade is hard, why not buy a new whose function can be enough for you.

 

Such as what? You have any ideas? All are welcome!