im sure others have opinions about this.. Im sure the only right answer is the one you will have in a couple weeks.. but for me it was 1 week with almost nothing going on (better than the burning look) and then I upped nutes to half strenght.. about one more week with very little top growth.. roots were growing tho.. then full strength after two weeks and they are now goin to town.

good humidity too.. dont need the humidifier.. temps should be fine too but you might want to add co2 with that HPS light.. that would make your temps ideal.