for only 4 T5 tubes they look really good dude. I love t5's though. Theres a dude on here who does SOG's under t5 panels in an undercurrent DWC systems. He has the 8 bulb, 4ft panels though, with 54w HO's.
anyways good job, if you can keep the plants alive on the first go round then your in good shape. and those things look healthy.