The 40-Watt 13″ U-Tube Replacement Lamp keeps your Flowton Fly Control Unit running efficiently. Yearly replacement is recommended to retain maximum black light output. The bulb is a 13″, 40-watt, high-intensity black light bulb, designed to work with the FC7800 and FC8800 models. All bulbs are easily replaced through the bottom of the unit, so replacement is quick and easy. This replacement bulb provides maximum luring power, so you can tackle bugs with the power to win.