A dual LED and incandescent security lighting system uses a hybrid approach to LED illumination. It combines an ambient LED illuminator with a standard incandescent lamp on a motion control sensor. The LED illuminator will activate with the onset of darkness (daylight control) and typically remain on...http://www.google.de/patents/US6909239?utm_source=gb-gplus-sharePatent US6909239 - Dual LED/incandescent security fixture
