They're fun to watch. If you watch for a while you will see that the bugs keep circulating around the light and eventually most of them get hit. The first time I put mine out I came back an hour later and there was about a 10 foot circle where there was only an inch or less between bugs. It took about a week before any fish discovered the night snacks. For some reason I can only get small fish 4 inches or less to feed at night. After running these for several years I've often checked in the morning after a calm night. By daylight I can't find a dead bug floating. I find that my BG will eat even dead bugs floating when early morning light hits. I've also spent time checking the effectiveness of this at different times of night. I've found that here in MN there are a lot of bugs until about midnight and then the number goes way down. Check it out after 2:00 am and you won't see hardly a thing flying. As a result I have mine on a timer and only run them from dusk to 2:00. I found an outdoor digital Xmas light timer that you can program to activate at dusk via light sensor and then run for as many hours as you want. So I just run for 4 hours after dusk.
