burnt tops of plants

last night one of the plants shot up under the lgiht and is now slightly burnt on top, all the leaves are crispy with some brown dead bits! is there anything i can do to help it?? will it effect yield?

Raise the kight of course and hope for the best. That damage can't be undone. The level of burn will determine how it will affect yield.

gutting its the biggest one aswell

That is always how it goes...... Good Luck with the rest of your grow.