So I am running a 600w plantmax MH conversion bulb in a sun system xxl hood. I am currently running it 23/1. I have my ventilation going... Carbon filter-fan-duct-hood-duct-out of room. My question is... Do I have to run the fan the entire time 23/1 the light is on, or can I run the fan on 2 hours off 1 hour? Check out my journal http://forum.grasscity.com/index.php?/topic/1370701-Larry-OG-scrog,-cherry-popping!