If you have quality bulbs and quality reflectors, it'll grow like mad!! To add a lil' more information:
With quality bulbs (spread across the tank) and quality reflectors, you can grow anything you want, under T5HO. I've been using T5HO for almost 5 years now, growing many species of Acropora. I currently have Acropora growing just fine, on the BOTTOM of my 27" deep tank, under T5HO. However, most of my SPS corals are in the upper half of the tank.