how vital is darkness during veg

I have read a few places that cannabis is a C3 plant. And doesn't need a dark period to take in co2. 24hr veg is fine.
 
I have read a few places that cannabis is a C3 plant. And doesn't need a dark period to take in co2. 24hr veg is fine.

i've read the same exact things many times, even read jorge cervante's saying how plants grown under 24 hours of light will grow 33% faster than plants that are only given 18 hours of light, but from experience, i've found that plants grow a lil better when they do have some dark period...
i like 18/ 6 myself...
 
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