jtsmoker , Look at the grows by the senior growers and see the yields they are getting and you will find none are at a 12 /12 , I started on 18/6 but I am now on 20/4 , for me this is the one I like , Yes you can do 12/12 , but your yield will be small , I tried it when I had some photos growing and for me it was a waste of time . But give it a go you may be happy with what you yield .