Leave your autos on 18/6 all the way Pasty autos don't need 12/12 to flower.
You could even push it to 20/4 for another couple hours of lovely light a day
No, I have run mine from germ to harvest at 24/0. I don't think the extra 4 hours or 6 hours really adds much growth, just wastes electricity, but I need the heat from my light. 18 is fine....no less
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