Im also reasearch about ppf and co2 supplementation is not usable to plant if you light is weaker than 700. Im looking for light with 1700 ppf actual wat usage 630w and i would need betweene 1000-1500 ppm co2.
So if you want to let your plant use that co2 you need to put more light ! Link of reasearch https://www.cocoforcannabis.com/how-much-light-ppf-do-you-need-for-indoor-cannabis/
Good luck
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