In a round-about way, light opens the stomata. The effect is strong. Lights out, they shut.
High light, means wider openings. This is how we see water issues when we pump up the lighting. The openings are forced wider and fluid loss occurs. Making them look dry at the root, when they are wet. They just can't hold on to the water that comes up. The easiest solution is to raise the RH. Alternately lower the light. Maybe the temperature and airflow. There are also dietary components of interest, but I think that's reaching. High K or low S won't do any favours. You will also find lower EC helps water move better, and warming the roots, if you dare. Oddly, warming the plant aids water movement through it, not through transpiration, but simply warmer water moves better. So cooling the room to reduce losses might not be as effective as imagined. Often to increase calcium uptake we are best to lower the calcium present in solution and warm the plant. The water is simply more fluid, and so you get more calcium carried into the plant, not less.
I wouldn't concern yourself with co2 too much. I have sealed crops in with polythene before, because the RH is so important that without it, co2 levels don't matter. I felt sure they would suffocate but it just never happens.
High light, means wider openings. This is how we see water issues when we pump up the lighting. The openings are forced wider and fluid loss occurs. Making them look dry at the root, when they are wet. They just can't hold on to the water that comes up. The easiest solution is to raise the RH. Alternately lower the light. Maybe the temperature and airflow. There are also dietary components of interest, but I think that's reaching. High K or low S won't do any favours. You will also find lower EC helps water move better, and warming the roots, if you dare. Oddly, warming the plant aids water movement through it, not through transpiration, but simply warmer water moves better. So cooling the room to reduce losses might not be as effective as imagined. Often to increase calcium uptake we are best to lower the calcium present in solution and warm the plant. The water is simply more fluid, and so you get more calcium carried into the plant, not less.
I wouldn't concern yourself with co2 too much. I have sealed crops in with polythene before, because the RH is so important that without it, co2 levels don't matter. I felt sure they would suffocate but it just never happens.