Welcome to Frag Outpost marami!
Most soft corals are able to adapt to almost any level of light, particularly lower light levels and still sustain good growth. I have seen nice SPS tanks lit only by T5's, but these tanks are usually a little on the shallow side and the canopy is packed full of T5's. One good aspect about T5's is that they are a smaller diameter bulb which allows for more bulbs to be able to fit above your tank. I would think that you should be able to sustain SPS corals in your tank with these bulbs, but I would keep the corals as close to the light source as you can.
Good luck with your tank, marami. Please post some photos sometime.
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