Patent ID: 6929376

Claim:
A lighting fixture, comprising: a first electrical system comprising a first set of electrical components operable by a first power source located remotely with respect to the lighting fixture; a first light-emitting device mountable to the housing and energizable through the first electrical system during periods of predetermined levels of light; a second electrical system comprising a second set of electrical components operable by a second power source located locally with respect to the lighting fixture; a second light-emitting device mountable to the housing and automatically energized through the second electrical system during predetermined levels of power from the first power source; a detector system having a first detector and a second detector, wherein the first detector senses a level of light and wherein the second detector senses a level of power from the alternating current power source; wherein energization of the first light-emitting device is exclusive of energization of the second light-emitting device; and wherein the first set of electrical components are distinct from and independent of the second set of electrical components.