Thought I would share this for what it is worth. I love to sit outside at night in one of four of these pens and talk to the birds. With any kind of light on I am amassed in flys. About a month ago I decided to try this and it works GREAT. I have a Bug Zapper for each pen and boy does it take care of it and do the birds eat good or what. When the bugs get zapped and fall on the ground the immediately get eaten. In the mornings I go out and shut them off and tap on the zapper and what is inside falls on the ground and there is a mad rush to get the fallings. Also, the light on at night activated the cd's I have hanging from trees with fishing line and the reflections help keep predators away.