The Inverlux Plus 3–hour Emergency pack from Relco Group UK provides an effective solution for adapting four pin fluorescent lamps for use in emergency lighting applications.
Capable of operating with both electronic and electromagnetic ballasts,this conversion kit automatically produces a constant level of illumination during an emergency operation,satisfying Part B requirements.
Source:
http://www.lightsmanufacturer.com/2011/07/relco-offers-a-solution-for-emergency-lighting.html
