Yes you have some heat burn on your plants from the lights I can see.

You may trim off the burned parts and any leaf that is NOT green. They do not produce chlorophyll so they are of no use to the plant.

You did veg them a bit long for the room you have. Everyone is correct that you must place a screen over the top to hold the plant down. You can also bend the plants and tie them down to keep them under the light.

Anything more then just trimming off the bad & dead leafs may prolong your flower cycle and reduce your end yield so keep that in mind.

Happy growing and Welcome to the family.

Check out my show when you get a chance you will learn many things you may have know before about this great plant.