Z how does that distance equate for a 1000w?

Z, If using a 1000w light, but keeping temps controlled in the low 70's, is there as much need for Co2 enhancment?, or do the cooler temps keep the Co2 levels from dissapating as quickly? Or am I totally off base, because I am under impression that heat caused by the 1000w ballasts/bulbs is the reason for the lack of Co2?

turtle...having 2 good fans, 1 to oscillate, the other toprovide airflow right across the top of the canopy, like you said, this works especially well if you have AC
latewood Reviewed by latewood on . quick question? How far/close should my400 hps light be to the tops of me plants ? any help welcome thnx. :) Rating: 5