The present invention is directed to an apparatus that drives a lighting system with multiple lamps. A phase shift mechanism is produced either by a digital method, an analog method, or a mixture of the two methods. In a digital method, phase shifts are generated by digital circuits comprising counters,...http://www.google.fr/patents/US8111016?utm_source=gb-gplus-shareBrevet US8111016 - Control system for multiple fluorescent lamps
