I have same problem. Plants out, plants get better. Plants in they get yellow, claw down, tips burn, stop growing (almost anyway) and eventually almost turn white.
Problem is I bought it in Sweden and don't know what the hell I am gonna do. Dealership haven't recognized the problems yet even though we were a group of people buying it at the same time and all have the same problem. I really hope it gets solved fast for us because I need a tent to grow in the space I am using and I don't want to wait a long time just and have to kill of my plants. I cant put them on 12/12 whithout the tent.
So mad right now.
Anyway, how did it go for you guys?
Puffzter