I did it as a test with two strains I had previously grown, as well as three I had not. I was 18/6 'til sex and 12/12 after. I'm sure there was a difference, but I didn't see it. It did not shorten the flowering time but, in my case, I didn't take them later either. Here are a couple albums I did with two strains from that grow.
my current grow has 5 females
in flower
the timer turns the lights on at
dawn and off at dusk
i just checked sunrise was 7:15 A.M.
and sunset was 5:30 P.M.
that is less than 12 hours
under T-8 lights.
i find 12/12 lower yield so what i have done start them on 24/0 wait 2-3 week no flower drop them to 18/16 wait for flower and keep them 18/6 for the rest of there life
Last run i finished 2 plants under 12/12 the last week.while leaving the others under 20/4. I must say that the 2 under 12/12 swelled alot fater and seemed to just finish out stronger and heavier.
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