More air means more co2 available to the plants. True enough that the % of co2 in the air doesn't change. What happens is that the air touching the foliage is replaced quicker. So any co2 used by the plant is replaced quicker. Dutch growers came up with 'Fast Air'. 5 extractions per minute, which is 25 times the amount usually recommended.
Blue61, at 27w psf, I don't think I'm going to have a problem with the amount of led light.
This grow is with cmh and rvk. Next grow led and rvk. 3rd grow led and I've yet to decide what to do with the AC Infinity S4. Use it for extraction or get some elbows and tees and use it for internal airflow. I'm not against internal airflow in principle. I'm against unreliable oscillating fans or any other internal fans that get in the way. The S4 could sit on the floor out of the way and give me 4 columns of air blowing through the canopy.
CHG, I have a 400w halogen heater. It gives off light but not enough to read by. A 600w hps will give plenty of light and some heat. To warm me up during a cold winter, I'd prefer the 400w halogen over the 600w hps. Watt for watt, more light = less heat.
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