I'm believed so too, but look at post #4 in this thread. That started it out of the blue, and the 12-1-thing was completely news to me, so I reacted - sorry.
But I barely touched the subject myself, the rest of my post was this:
But that other idea, giving less hours of light (gradually) during flowering is something I've experimented a little with.
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I did two grows with same mother plant.
One grow with 12/12 all the way, and one with 12/12 but then gradually down to 10/14.
It made my plants ready about 14 days earlier, but with loss of yield (maybe about 10%, was obvious to the eye anyway).
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Flowering times are an interresting subject, and gradually reducing light and temperature during flowering (especially at the very end) is something I find appealing.
I'll use the cold of winter to my advantage the last two weeks, I'll try and see if the plant changes color (I'll not go under 17 degrees celcius, I'm a wuss).
Also, I'll try to raise the light a little last two weeks.
BTW: Where does 12/12 come from anyway, was it decided in a vote back in the 60's?