I read the ad for 'Night Guard' lights in Back Yard Poultry magazine and decided to give them a try. I have a large wooded lot next to my fenced chicken yard and am worried about racoons or possums getting into the hen house. The lights are simple solar charged red flashing LED that is supposed to frighten predators by tricking them into thinking they're being watched at night. I've only been using them for a few days and was thinking of getting some more but at $30 a pop, they're rather expensive. I was wondering if any one else has experience with the product and would like to hear your opinion if they work.