Some look a little light in green color even though its hard to tell under the HPS. That can be from your plants not getting enough nutrients or it can be a possible problem to where your plants not uptaking nutrients properly. They look good overall though. Any chance of a couple pics under normal light? Also you should hook them up with bigger pots they are ready to get big . Are you flowering them atm?
i had some root rot problem so i just took care of that so thats why they are kinda light probably its my first time im just using some generalhydro maxigro i have had them for about 3 weeks at a buddys house
I kinda thought that at first, but look at pic 3, the dark plant to the left at the top. If it was a nitro def. wouldnt the inter-venal chlorosis start at the bottom of the plant like a PH issue instead of starting at the top?