Those T5's 8 tube 4 footers are awsome and in my opinion way better than a a big MH. They stay cool, don't really burn plants, no ballast and are pretty reasonable with regard to price. You can easily veg 24 inch plants under them. You might consider giving more space width wise to the flower space and shrink you veg area a bit. You'll need it. You can take care plants during veg in a fairly small place but when you flower, the pots get bigger, plants bulkier and may not be able to be moved around easily. Also if you have to tie them up with some heavy hangers it really gets tough to shift around. Give yourself some room in flower area. Depends on how may plants you wanna veg but, T5's 6 tube may be better. It's less wide. Good luck. Pictures would be cool. I just realised that the room is done. Walls are up??? Or is this just a design? All those lights... ventilation/air will be key. Hope this helps. A little.