u gotta seal those lights up with some weather strip or us fire resistant caulking for stoves. or run a air purifing ionizer wind tower instead of fans to eat up the smell. even with ur sec plan ur going to have smell going threw those lights.( zero).. he wasnt pushing air threw the filter on the first one.... a 600 watt light in a 4x4 room is alot of heat. i would also switch that since u dont want the hot air going to ur hotter light. have the cold air pass threw the mh room last. switch ur rooms. im not a newbie