Quote Originally Posted by Malsor
great info, im still confused about the vent holes. What size exhaust vent and what size vent for passive intake? Im going to be using a inline duct fan, not sure what size yet.
If you do the cool tube method, 6 inch inline fan with 6 inch ducting, you'll need that much to accommodate the bulb. If you chose to go with a reflector instead of the cooltube, you'll need a 4 inch inline centrifugal fan minimum, with a three inch air hole. And yes you'll still need the circulation fan. If you go LED, you only need a couple of computer fans for intake and exhaust, use a couple 120mm for exhaust and a couple 80mm for the circulation/plant airflow/intake.