light bleaching/burn

i just bought some hlg 550 v2 and unsure if i have the lights too low. they are hung at 28 above the canopy on the left hand size(older plants approx 6 weeks) and 38 inches on the right hand side (about 3 weeks old) temp os approx 75 at night and 77-83 daytime as the temp has been going up and down in michigan. humidity between 60 and 70 rh.

Looking good, bleaching turns them white and heat will literally burn. The lighter green colour is just new growth