I've been running T5 only fixtures on my reef tanks for the last 5 years or so and I keep nothing but SPS corals.
I had a 8 x 54 watt Sfiligoi stealth on my 90 gallon reef and I now have a 12 x 80 watt Sfiligoi stealth on my 225 gallon reef. I had originally wanted an ATI powermodule but they were severely backorded at the time so I ended up going with Sfiligoi. After seeing the build quality of the first fixture, I'd have a tough time going back to anything else.
Previously I had been running metal halide and was unhappy with the excess heat as well as the general color of my tank. With a 12 bulb T5 fixture, I can now mix and match bulbs to get the tank looking exactly how I like without having to worry about sacrificing PAR. My current tank is 24" deep and I have no problem keeping SPS alive and happy on the sandbed so long as they aren't being shaded by the forrest of acros above.
The only drawback IMO to using a strictly T5 fixture is the cost of bulbs, especially if you are using 80 watt. I spend ~$400 to $450 every year on bulb changes and I need to order them in from the US as I've had a difficult time locating the 80 watt bulbs from Canadian retailers. ReefGeek has a good selection but you pay a premium for shipping. Luckily I work close to the US border so I get most of my equipment shipped to a border town that has a package holding facility for Canadians.
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