Emergency Driver Series NumberSWWCLEB20W, SWWCLEB25WVoltageAC 120-277VLED Watt20W, 25WCRI>90Dimensions12.7" This emergency driver is for LED products with an external driver. This backup is a UL recognized LED lamp. In the event of a power outage, the LED Lamp Emergency backup switches into emergency mode and operates the existing fixture for 90 minutes.