C.E.
Quick comment before I get going. I have the same set-up as Mellow and run 22 hours at minimum. Turn LED off just to give it a cooling. I adjust the height from time to time to give plants a change of pace--just something I do--must be out of compassion. All in all they respond well. Humidity must be over 40% or they will get upset. LOL.
However, I have not been without some minor growing issues, e.g. PH.