The electrically charged inner grid carries enough power to kill insects that encounter it. The light in the center attracts the bugs. Many zappers combine visible and UV light. Those work great ...

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 ... a barrier-type spray,” Markowski ...

It is also effective against all germs, even newly-emerging pathogen strains. How to use a UV light to kill germs at home UVC lights available to consumers come in various forms, including boxes ...