Ken,
I have the T5 HO Florescents approximately 4" from the leaves. Never had any issues with burning. They do not create alot of heat.
I use things to raise them up so that I can have taller plants under at the same time.
Rick
"Many times a day I realize how much my own outer and inner life is built upon the labors of my fellow men, both living and dead, and how earnestly I must exert myself in order to give in return as much as I received"
