What kinda light setup do you have ? I was using a 400w HPS at 18/6 now if you have say a 1000w HPS I would think that even though its less light time but the better quality of light for at least the 12/12 would equeal out maybe. If worse comes to worse its natural for them to go at 12/12 anyway so it should still be ok. Also 2-3 grows in your gonna start to get to know this strain and next time do it at 18/6 and see whats different. Also if possible get another light and place somewhere else. I got a CFL shoplight set up from YardBirds with two 65w bulbs and a basic reflector for $34. So I have stuff going in two spots so I just keep my seedlings and LR's together under it and have two curing now....I've been really tempted to just smoke it up but I want to cure it right but its tough this my first ever grow.