The germination instructions I received from ILGM says to keep light two inches above pots. My question is after they begin growing, do I maintain the two inches above the plant or a different height?
With a T5 setup you can basically always keep the fixture about 4" away from the canopy.
Just use the back of your hand as a tester when you set the lights above the canopy.
If your hand gets too hot, move the lights higher. Hope this helps!