The Flowtron UV replacement bulb delivers high intensity brightness that lures the insects into the electronic insect killer. The 40W bulb in a compact U-shaped design is compatible with the BK40CCN bug zapper light model that helps to keep the insects away in your outdoor seating or dining space. Replace the bulb annually to maintain optimal power efficiency. | Flowtron 40-Watt UV Replacement Bulb for BK40CCN Bug Zapper Light