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I know its been touched on before, quite some while ago. I was curious if anyone has had any success or opinions on giving a dark period before 12/12 switch? Thanks.

SWIM (someone who isn't me) has their first grow, I am just helping with research. 300w led, inline fan and carbon filter keeps grow box air, negatively pressure. Its a very small grow. Right now at 51 days veg, they stand at 9 inches tall, super thick and bushy. No signs of preflowers yet. Is...