 Nocturnal insects, many of them, not all of them, many of them are attracted to lights. And there was just a paper the other day still trying to figure out why that is. It's very complicated. It doesn't matter why it is. They are. They will go to your lights. And there's about 10 ways that lights kill them. They get exhausted by flying around or they get incinerated or they simply sit on the wall of your building and then birds come pick them off in the morning.