The main reason I needed a bug zapper was for an acute mosquito problem. My wife and I couldn't sit on the rear patio for more than 10 minutes without getting eaten alive. The problem occurred mostly around dusk. Purchased the Stinger Ultra from Lowe's. It did seem to help but the problem was still there, they were still biting. The unit was positioned about 25 feet away next to the pool. The Stinger with it's 40 watt single ultraviolet bulb was low intensity that seemed to attract mostly moths and other harmless insects. I did use the Octenol Mosquito Attractant which did not seem to attract them very much. What insects that were killed got clogged in the inner grid which was difficult to clean. After reading many favorable reviews on Amazon I ordered the Flowtron 80D. WOW what a difference. This unit contains two 40 watt high intensity very bright ultraviolet bulbs. After only 30 seconds from plugging it in all I heard was Zapp Zapp Zapp. It was killing mosquitoes along with every other insect within range. In comparison the Stinger Ultra was like a single shot revolver compared to the Flowtron which is like a MAC 10 sub-machine gun. If you have a mosquito problem this is your answer. Highly Recommended.