I'm not arguing shit brother..
I'm saying it's heat from his fixture. He's burning his plants. The cause is from a 400 watt HPS that he added to the mix 2 days ago when he noticed the problem begin. Why make it more complicated than it needs to be for the guy? That's the point I'm trying to impress upon you perhaps.
I don't think it takes a pic or more information to help the guy out with something so easy... Or maybe I expected more from you.. what ever.
hey OP .. post a pic so lime can help you figure out what it could possibly be - beyond a shadow of a doubt - the possibilities are endless I guess.