There are people in our community that believe that you can grow start to finish 12/12
maybe not as much here at cdot, but I read arguments to that affect several times in the months of reading I did before attempting to grow again. Their argument is, that in equatorial regions, it is always close to 12/12. So, if you lived there and grew, that would be the light cycle that you had. I do believe a strain or 2 have been developed down there.