Those are great discussions on this topic, thanks @bmorgil .
I’m aware of the other discussion. I’ll just paraphrase what was said in the other thread, I’d rather not attempt to debate it, I feel like it would be like trying to argue the finer points of calculus to a cat.
Depending on how the plant is growing, you might only get the flowering that directly leads to full flowering. Pre-flowering is dependent more so on the genetics of the individual plant. It is kind of like auto flowering, it happens at a certain age or development of the plant from seed. Sometimes certain stresses can also cause pre-flowering. The difference from regular flowering is it will not continue to aggressively flower if the light to dark period is not correct for that strain.
The photoperiod (length of light period per 24 hour day) is the main or strongest influence on when the plant flowers, but it is not the only environmental factor, temperature drops also can influence the same and similar hormones that the short photoperiod has an effect on.
@FloridaSon, here is a great you-tube video that shows how all this works and why 2 minutes, more or less, from one day to another isn’t all that important nor is it exactly what a day is in nature, and how longitude, latitude and the rotation of the earth are so important to sunrise and sunset: