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.