intake and exhaust

should i put my exhaust fans on when the lights are off?

"should" depends on circumstances... but in the spirit of your question, i leave my exhaust on 24/7 for air movement and exchange. my grow doesnt get too cool though... and thankfully, it doesnt get too hot anymore

ok sounds like im going to leave it on then
=)

the way i think of it is: if YOU were locked in a closet, would you want the exhaust on or off?

hahahahahaha
love the logic
=)

yeah make sure your girls are getting enough fresh air.

its always good to have air circulating in your grow area, its helps keep o2 pockets from building up undernearth all those leaves...keeps co2 circulating...which your plant likes very much!!! the constant stimulation from the fans will also build up the strength of the stem.