A plurality of spaced ceiling mounted fixtures or other controllable electrical appliances have radiation detectors mounted within each fixture and wired internally of the fixture to a dimming circuit or to a ballast. The radiation detectors have sensitivity over a wide angle and have elongated plastic...http://www.google.fr/patents/US6667578?utm_source=gb-gplus-shareBrevet US6667578 - System for individual and remote control of spaced lighting fixtures
System for individual and remote control of spaced lighting fixtures
