My first thought, due to the curling/twisting of the branches, is too much moisture. Another reason could be too much fertilizer... or a combination of the two.
Inspect the stems/branches, as well as the underside of the leaves, for little white blisters - I thought I saw some in the pictures. If you do see them, it is an edema (or more specifically, an intumescence).
Check for that first and let us know what you find.
Edit: It's not your lights or the distance between the lights and tops of the plants. I keep mine about 1-2 inches from the tops... and I use T5 HO lights.
Last edited by Koala Doug; April 13, 2018 at 03:05 PM.
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