For outdoor grows when you can't flip the sun to 12\12 when you plant your seeds.Great thread. I think i'm sold why bother with autos when you can flower a plant in the same time, with less light, a higher potency, and bigger yield.
I doubt earlier, but I know some will use such light schedules such as 13/11, 11/13, 10/14 for rather large sativas.I've been thinking. Couldn't you start lighting at 10/14 instead of 12/12 and harvest even earlier?