Ciralight caught the attention of a few attendees at this year’s Greenbuild 2007 exhibition. Their flagship product, SunTrackerOne, is free-standing, solar-powered, and completely self-contained. SunTrackerOne has three mirrors that track and reflect the sun into buildings through a thermal barrier, light well, and diffuser. It’s different than passive lighting because it collects more light and diffuses it more effectively throughout a building. This lighting system is a major green innovation to keep an eye on, especially since Ciralight touts a seductive 15 – 35% return on investment on energy savings alone.