The PS600QD from Power Sentry is an emergency backup battery that operates at a reduced light output of 600 lumens to provide glare-free illumination for 90 minutes and ensures a long life over a wide range of temperatures. Once the wiring harness is installed, no extra wiring will be required for the fixture's life. Patented Quick-Disconnect connector system allows for quick and easy replacements at end of life without rewiring.