I don't know for sure, But when I added a 400w HPS the temp. got to 90 deg. and a within a week, my leaves curled like a claw. I killed the HPS and went back to CFL and some leaves look better. I have no idea what the real problem, also PH was high 7 almost 8. I fixed that problem, maybe this is what is happing with yours.
I for sure am not the one with the answer. Good Luck.