Dont take the bulb out of the casing. They are sold in the case to be under i think .05 something which will not give you cancer in one day. I made one that was good for about 10,000 sqft once and with in seconds the smell was gone. I left it in the room with the plants and when I checked on them about 20 hours later they looked sick as hell. I lost 20% of the leaf in my room and stunted the growth for almost two months till I brought them back to full health. It is really bad for you and your plants. I recommend ozium plug in sprayers used in public restrooms. They spray every 15min and cover smells great. All organic too.