The Flowtron BF150 40W Replacement Bulb keeps insects away throughout the night. This bulb features a tight U-shape. This insect killer bulb delivers black light emission to effectively attract insects to the insect killing device. Fits: BK-40, BK-80C, BK-80D, GL-2400, FC-2600, FC-4400, FC4410, FC-4800, FC-4810, FC-4700, FC-7200, FC-7600, PM-2040A, PM-2080.