The first time I used it, it zapped a huge number of moths and other large insects. Then I used the mosquito attractant and in one night it captured a huge number of mosquitos.  Here's the strange part. Since then it has zapped very few of anything,  even when I used a new pad of mosquito attractant. Could it be that it has covered such a large area that there are no more bugs or mosquitos available?  This is hard to believe. To preserve the light and mosquito attractant I now use a timer to have it on only from 4 hours after dusk.