A ballast for use in a multi-ballast lighting system wherein the ballasts are coupled together by a digital communication network. The ballast comprises a power circuit portion for providing an electrical current to power a lamp. The ballast further includes a sensor input circuit for receiving at least...http://www.google.com/patents/US20060125426?utm_source=gb-gplus-sharePatent US20060125426 - Distributed intelligence ballast system and extended lighting control protocol
