by the time the light scedule is 12-12 it should already be done flowering anyway, normally a plant will start flowering outdoors at 15 hours of light 9 hours dark, but then gradually getting shorter, the shorter the light hours get, the more horemone builds up in the growth tips, till enough has built up to trigger the final swelling of calaxes and ripening to complete.
this won't work for you however becuase your plants are used to a much shorter light scedule, one with a long enough light time enough to maximize bud growth while still having a long enough dark period to allow final ripening in a decent amount of time. i would suggest you guys just stop fighting before you get reported, and stockrock, just keep doing what your doing, shouldn't take more than 8-10 weeks for harvest from when they start to bud.