Patent ID: 8575787

Claim:
An emergency lighting system comprising: a battery; at least one LED lamp assembly; an AC power source; a control device electrically coupled to the AC power source and selectively electrically coupled to the battery and selectively electrically coupled to the at least one LED lamp assembly, wherein the control device is configured to sense AC voltage from the AC power source; and a means for energizing the at least one LED lamp assembly at a desired lumen level for a desired period of time in a fault operation, in which the control device senses a loss of AC voltage from the AC power source, wherein, in a non-fault operation, in which AC voltage from the AC power source is sensed by the control device, the at least one LED lamp assembly can be selectively energized via the AC power source or the battery, and wherein, in the fault operation, the at least one LED lamp assembly is energized via the battery.