The Bodine LP-550 emergency ballast provides emergency operation for 90 minutes. Compatible with T5 standard or high-output lamps. This ballast works in conjunction with the existing ballast on your fluorescent lamp to maintain illumination during outages. By working with a ballast, the LP-550 does not affect normal fixture operation and may be used with a single 14 to 28-watt lamp or two 24 to 54-watt lamps. Transform any fluorescent light into an emergency light with the Bodine LP-550.