The lights in the flower tent are about 19-21" above the canopy. I don't want them reaching for the light so I'm letting them grow into it. I have a few inches I can raise them and will likely do that after they're done stretching, which should be just about over. For the seedlings I'm at 26". My lights don't dim, they're BD Phytomax-2's. I have two 600W in the flower tent and two 200w in veg, though I only have one of the 200w's on at the moment. When they get bigger I'll turn on the other light for coverage.How high are your lights and what percentage?