the lights you have can not burn a plant at any height except maybe if the plant actually touches it.
Be careful a lot of people on here will tell you B.S. and they don't really know the answer for themselves, they are just guessing.
Keep floros and cfl's as close as possible without letting the plant touch. if can be a little bit away but you loose light energy.
Looks good. Just keep it simple. Just be giving them water right now. No nutes. Make sure you have a lot of fresh air, both coming in and being exhausted. And you will be good to grow.