More light = better use of available co2. Am I right?
Aiming for ~1200ppm for entire lights on period. Constant purge of fresh air when lights out.
Within reason, the extra co2 allows the plant to process more light.
Without sufficient lighting you won’t be utilising the extra co2 being dosed.
You also need to get temps up 2 or 3 degrees more than you usually would. The plants will need slightly stronger ppm in feed.
Watch how much they drink though as they should drink more and in turn uptake more nutes so essentially will be uptaking more nutes in their feed if that makes sense?
also be careful not to run your humidity too low with the higher temps as the plant will drink a shitload and go into survival mode and start to close stomatas (stomatas are what absorb co2) and will make the extra co2 being dosed useless.
So it’s all a balancing act and you really need your room fairly dialled in to reap the benefits.
and yes, the plant does not process co2 with lights off. Bringing in fresh air with lights off is a good thing