We went camping to a lake with a lot of gnats and other flying pests. If I operated a headlamp I would get mobbed.  I put this out at dusk, plugged into our RV, and just sat and watched thousands of gnats vaporize into oblivion. Took me back to my ant - frying magnifying glass days.  And while I had that zapper going I could have a headlamp and was pretty much left alone.  Fun AND effective.