Plants like these will flower if taken from 18/6 OR 24/0 down to 14/10.

I know for fact, White Russian (cross breed of white widow / ak47) produce more THC under a 14 hour light cycle.

12/12 is perfectly normal and will induce flowering as well.

Your question still is unclear to me.

It DOES matter how much light they get and the frequency and schedule.

Pick one and go with it.