After reading through the forums about C02 methods I've decided to use dry ice because I have a local distributor and it's cheap. I was wondering if anyone knows how much dry ice to use a day for a 3x3.5 closet setup so the plants get appropriate levels of C02, there will only be 4-5 plants. In the guide it said some growers put dry ice above their light so it showers the plants, this is very possible for me to do but in anyone's opinion is this safe or need I not worry.
Also is 600w HPS too much for this area because I'm debating on 400w or 600w, I'm planning on it being air cooled. Any help would be greatly appreciated.
