Morris Products 72900 Flourescent Emergency Lighting Ballast, 9.4" Length, 2.4" Width, 1.5" Height, 500 Lumens Fluorescent Emergency Lighting Ballasts T8-T12 - Fluorescent Emergency Lighting Ballasts for Power Failures. Fluorescent Emergency Lighting Ballasts T8-T12 features include: Fluorescent Emergency Ballast allows the same fixture to be used for both normal and emergency lighting In the event of a Power Failure, the Ballast Switches to the Emergency Mode and operates one or two of the existing lamps for a minimum of 90 minutes