Energy efficient homes are now getting more and more each day. The Brightbuilt Barn by Kaplan Thompson is a super energy efficient prefab design that is located in Rockwood, Maine. The LED light skirt that lets you know if a structure id generating more or less energy than it is using is probably one of the most interesting green feature of this building. Since the LED light skirt determines the energy production versus usage of the house, it can be determined thru its colors. If the skirt turns green it means that the building is using less energy than it produces, when it turns yellow it is breakeven, and when it turns red, the building uses energy more than what is it producing. Pretty simple and easy to understand that helps a lot.