If I mention somethng you already know, sorry.
not sure exactly what your asking....


when you switch lights to 12/12 you are switching your plants to flower-mode.

this usually means a different bulb/light setup.

the act of switching lighting from (18/6 or 20/4 or 24/0 - on/off) to 12/12 triggers flowering hormones in the plant. some plants are so sensitive to the change that one night-cycle switch, and switching back to 18/6, and the plant will need to "reveg"...

outdoors, when the days shorten to a certain length in hours, triggers the same hormone changes.

sometimes toward the end of a flowerring cycle you can "encourage" your girls by switching to 11on/13off and flushing them. I wouldn't bother with any less light unless you have a specific strain that wants something different.

otherwise remain at 12x12 for flower.