To use our oil warmers, simply add a few drops of your favorite scented oil to the oil dish and turn the warmer on. All of our oil burners have a dimmer switch that allows you to control the heat generated to warm the oil. Turn the dimming switch down low and the halogen bulb heats the oil slowly, giving it a light fragrance. Increase the intensity of the light and the level of the fragrance. The bulbs are replaceable in all our electric oil burners.