Patio Citronella Torches, Citronella Lanterns, Citronella Oil Lamps. Patio torches and oil lanterns are a low-maintenance, beautiful way to decorate your backyard for evening use. Citronella torches can keep your guests safe, by lighting areas that may be unsafe in the dark. The most common type of fuel is the paraffin oil. Citronella oil is the fuel especially used at those places where there are a number of insects. Citronella torches and oil lamps will help you keep a variety of bugs away. Always keep torches and oil lanterns away from flammable materials, never light them indoors.