My plants always use the most CO2 during the first three weeks of flower by several hundred ppm per hour.
Without getting too technical though Ill try to think through my screaming children.
The first limiting factor is light. No light=No photosynthesis. Light creates light dependent reactions within the plant. The more photons the more ATP and NADPH is produced. These light reactions will eventually plateau and become limited by the next factor which is CO2. The Carbon in CO2 will produce the carbohydrates within the plant until this too plateaus. Temperature does not effect the light dependent reactions from photons but it does effect the light independent reactions. These reactions are made by enzymes in the plant that have an optimum temperature to do so depending on the species. It is hard to pinpoint for sure but anywhere between 77-85 seems to me to be optimum. Once the temp goes beyond this point, it begins to effect it negatively. Get all three on point and you can't do much more.
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