Nah man thats burn. No doubt about it.

remember, those leaves can be very very very young and burn even when they are little leaflets shooting from a grow tip. If burned when little, they will grow up burned as well.

I have one plant that is covered from that....but the head was blowing against the lamp and here we are, weeks later, looks burned . I'd post a pic, but muther fucker i am way too stoned to fuck with them anymore.

As for the more general tip burns, or whatever, that is a different story. I usually find that to be a over water problem, or pH problem or root tip hitting something it doesnt like problem.

But way too common and it doesnt hurt the plant it seems....

I bet you all I am higher than you