I understand theory, don’t agree with light schedule guidelines...12:12 works, imo...i bet, if theory wirks at all, it wirks for anything between 12:12 and 12+ upto 2hrs less (5 to 15min) fr on:12 - fr on works too....perhaps to varying degree based on schedule...
The concept is plants that instantaneously go into sleep mode from “end of day” fr (photo cannabis does, not all plants do), can get by with less lightsoff, thereby providing opportunity to increase photosynthesis time for shorter flower period or greater bud wt, can also be that there is incremental benefit from extended dark processes (complex carbo fixing, tissue devel & growth, extract production, etc.)...
the schedules are totally unsupported by statistically valid cannabis research, as far as i am aware.
You have other than hearsay about schedules, please link..