Even as lighting technologies change, Emergency Battery Backup lighting requirements still remain. In the United States emergency lighting system specifications for illuminating the path of egress in commercial and public spaces are set forth by the Life Safety Code, NEC, and IBC, which define the duration and illumination level to be provided.
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Several methods are available to achieve the emergency lighting requirements, such as using dedicated wall-mounted fixtures, however, a popular and less obtrusive choice has always been to use the existing fixtures to supply the emergency lighting. LEDs are a good solution for emergency lighting because of their longevity and low watt usage. An emergency lighting system can use the existing LED fixtures by utilizing an integral auxiliary battery pack or remote-mounted unit inverter system as the emergency power source. When normal AC power is lost the emergency battery pack or inverter switches on and operates the fixture for the required duration.