How do Emergency fluorescent ballast work?

• Works with or without an AC ballast to convert new or existing fluorescent fixtures in to unobtrusive emergency lighting.
• Operates one or two lamps in the emergency mode for a minimum of 90-minutes

They are specifically designed to provide emergency lighting of fluorescent T5, T8 fixtures with the loss of power. The unit's low-profile configuration makes the series suitable for most pre installation and on-site applications.