First of all...You are in a hydro room asking us if you should use Hydro or soil? Reeeeeally?????

You need to use hydro...whatever method you use will be quicker and will yield more over time than soil applications. Soil takes almost an extra two weeks of vegging and almost another two weeks at flower.

Hydro means...you control everything. So when the plants die...its your bad. Not nature. LMFAO!

Yield depends on the strains being grown, how long you plan on vegging for, what you are feeding the plants, how often you feed the plants, etc. etc. etc. Basically, whatever you were expecting to get from your first grow...divide that number by 4.

I am just getting to the point of growing inside (about a year now) where I can get 400-600 grams per square meter. Be happy with anything at, or above, two pounds.

I hope this helps.