yeah but the question was strain dependant
LOL - most people look on 'strains and seeds' when they want to know about plant genetics so it's not as widely viewed as the grow boards - and you are asking a growing question.

I'm not having a pop m8, just saying more people will see your Q on the other boards.

anyways - 15" sounds about right to get an oz from each plant (probably a bit more if you treat em good) with a 400w.