I recomend the sentinel chhc-1 total climate control.http://www.hydroponics.net/i/133932
I got it a moth ago and I love it.
it controls temp.humidity, and co2 leverls. perfect for co2
I am curently building 2 rooms
grow and bloom
grow = 3x400watt. 120v , 2x1000watt 220v
flower= 6x1000 220v
I was looking at this link online: http://www.hydroponics.net/learn/grow-light-controller.asp
I wanted to get your imput and see if you could make a few sugestions for this particular...