I have had this for 2 seasons now and the body count has to be in the millions by now.  When I come out in the morning there are so many mosquitos fried on to it that I can't see the light any more.  I unplug it and give it a few taps and let the bodies hit the ground.  Usually my chickens come over and clean it up.  I joke that they love to eat breakfast at the bug light caf.