We're confident flies, gnats, and fruit flies won't be able to resist the allure of the blue and UV light, shining brightly from your Trap, Kelli, given a little bit of adjustments. Our Quality Team assures us that all Traps effectively rid your space from these winged pests, especially if the unit isn't blocked by anything and it's the brightest light in the area. Reduce other light and take care that the outlet you're using is right out in the middle of the action. We're here to help, and are confident we can, so call us any Monday through Friday, from 9 AM to 6 PM, EST. Our number is 1 (800) 374-9429.