OD47-This will be my first time, so I can't say anything for certain. I don't see why you couldn't use T5s for flowering. As long as you use 3000K (warmer spectrum) bulbs, the lumens produced should work fine for flowering. The posts on T5 use is fairly light (no pun intended) which is a big reason this thread got started...

With that size of an op, you should be the one telling me!

Good luck though!