You probably should move the light further away instead.... and it looks a little dry too. The edges curl up to reduce the surface of the leaf when they get too much heat, prevents evaporating faster than it can "drink".
yeah raise it up a bit and get a fan blowing inbetween the lights and plants. i had same issue when mine where about the same size are yours. lights can be close but back it off a bit. let hte plant reach a bit.