Water cool the air after ducting it through your reflector! No venting to outside your growing area, no adding more AC to your room, just attach the Ice Box to the end run of your ducting from your reflector or to the reflector and cool that air. Acts as a radiator for your light. Needs a water chiller to pass cooled water through it and as the hot air passes over the internal vents filled with cold water your air gets cooled. Now you can have truly air cooled lights. Fits 6" ducting.