The UFO-3AW emergency battery pack works in conjunction with a fluorescent fixture's normal AC ballast to convert new or existing fluorescent fixtures for emergency lighting operation, eliminating the need to install additional emergency lighting units. The UFO-3AW can be used with one 17W through 40W (2' - 4') T8, T10, or T12 fluorescent lamp without integral starters, including U-shaped, HO, VHO and circling. It is also compatible with most 1, 2, 3 and 4-lamp electronic, standard magnetic, end-of-lamp-life and dimming AC ballasts. If used in an emergency-only fixture, no AC ballast is necessary. The UFO-3AW produces 350-450 lumens initial emergency light output. During emergency illumination, one lamp is illuminated, even if installed with a multi-lamp fluorescent fixture. Standard Features Include: Compatible with electronic, standard magnetic, energy saving, dimming and end-of-lamp-life AC ballasts Provides 90 minutes of emergency lighting Battery case made of heavy 22-gauge steel Dual Input 120/277 VAC, 60Hz operation Maintenance-free Nickel-Cadmium battery Easy installation with versatile mounting capability inside of ballast channel, on top of or remote from fixture Can be used with switched or unstitched lighting fixtures.