Im probably being paranoid, then again I had just read the BHO thread and some linked stories of people blown their houses up. Is there any benefit to this in a non sealed room? My summers get hot, I was battling 90's with cfls last summer, and just switched to an HPS (although I think my temps went down. It's been cold though since the switch) Also, again the levels should be low but when you go into the room do you bother wearing a mask or anything? BHO thread lingers *shudder*