Review (1/5): Ring soaks up oil
I really wanted to like these and thought they would be a great alternative to aerosol sprays. The ring was too big for several lamps. You need a full size light bulb for this to work. I use a small, low watt bulb in many of my lamps. Second, the porous material of the ceramic soaked up all of the oil almost instantly. I used an oil with a strong fragrance and could not detect anything after a few hours. Good idea but sorry I purchased this. Not worth the money.