Can I Buy an Indoor Mosquito Trap? RELATED: https://gab.com/bugzapperlightbulb Yes, but it’s important to understand their limitations. According to Markowski, indoor mosquito traps don’t work well. That’s because most use an ultraviolet (UV) light to lure them in. The problem: Mosquitos aren’t attracted to UV light. Any mosquitoes that wander into a trap do so mainly by chance. But what about your outdoor bug zapper? Those use UV light — aren’t they killing mosquitoes? Not really. “Bug zappers attract all the moths and butterflies and all sorts of good bugs,” Markowski says. The University of Delaware found in 1996 that of all the bugs killed in zappers, only 0.22% were mosquitoes and biting flies. More recent studies at the University of Notre Dame put the percentages at 4.1% and 6.4% over an entire season.