The Philips Bodine B90 fluorescent emergency ballast provides an economical way to deliver emergency illumination. Whenever normal AC power fails, the B90 senses the loss and immediately begins powering the lighting unit. The B90, utilizing a high-temperature, maintenance-free nickel-cadmium battery, will support the lighting load for 90 minutes. The emergency ballast is designed for one-lamp operation and provides up to 600 Lumens in emergency mode. It is suitable for indoor and damp locations and compatible with end-of-lamp-life circuitry. The B90 is UL listed.