T5's are plenty good. It'll take a little trial and error on how close to keep them. Patrick says 8-10 inches high. That would be a good starting point. (If they get leggy lower them, an if they sunburn in the first day raise them) Just in my own experience. Higher was better in my setup. An maybe just me, but I run mine 18 on 6 off. With good growth results. Just a little heads up. If, in a pretty enclosed area, T5's still put off a ton of heat. Find a way to monitor the pot and seedling temps.