Hmmm...interesting seeing everyone's opinions on light timing.
I have mine on 16 on 8 off...8 bulb T5 light. these are my veg plants at 4 weeks from seedling breaking soil.
Just waiting for sex to show now before I choose the 2 best for a SCRoG.
They are two different strains, The Black and Original Blueberry. Indicas
By the way, yours look like your normal 2 week old plants...you can top em now too.
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