Consequences of nute burning during veggin..

I have a few plants growing in a tent under a 1000W light..One of the plants has as much yellow as green..
Are my plants done?? Or what are the consquences of them being nute burned??
BTW They are ready to go into flowering, but are still at 18/6..

Pictures are where it's at

If they aren't flowering then no, they aren't "done."

Odds are if it's just some mild yellowing they are probably just Nitrogen, and possibly Magnesium, deficient. If the yellow is in the new growth then it is likely you are short on Iron and Sulfur. One way or another, yellow plants in veg are usually hungry, so feed them.