We have spent countless hours developing our special UCO candles. Wax formula, wick size, and other features were specially engineered to make these the ideal candles for our lanterns. Other candles can melt down prematurely due to improper wax formula and can leave significantly more soot on the heat shield compared with our candles. We recommend using only UCO candles in your lanterns. Citronella oil is mixed into the paraffin and the scent is released as the candle burns creating a natural insect repellent. For use in Original Candle Lantern, Original Candle Lantern Plus LED, and Candlelier Candle Lanterns.