Low Profile BAL500LP Lumens Ballast - Fluorescent Works with or without an AC ballast to convert new or existing fluorescent fixtures in to unobtrusive emergency lighting. Operates one lamp in the emergency mode for a minimum of 90-minutes. Provides a maximum initial lumen output of 500 lumens. Dual 120/277 voltage. Charge rate/power “ON” LED indicator light and push-to-test switch for mandated code compliance testing. 4.8V long life, maintenance-free, rechargeable sealed NiCd battery. Internal solid-state transfer switch automatically connects the internal battery to fluorescent lamp for minimum90-minute emergency illumination. Fully automatic solid-state, two rate charger initiates battery charging to recharge a discharged battery in 24 hours. Time delay enhancement to overcome end-of-life circuit protection. Suitable for installation inside, on top or in remote of the fixture. Specification Sheet Click Here