Aurora Low Voltage Train Halogen Emergency Backup is maintained low voltage lighting train to operate 12V tungsten halogen lamps in the event of power failure. Includes 60VA electronic transformer, low voltage lamp holder and LED charge indicator. Can be installed through a 60mm ceiling cut-out. Provides 3 hour backup duration with a 20W MR16 lamp or 1 hour duration with a 50W MR16 lamp.