The PRO APF 12/8" IRGL is an inset runway guard light with or without a support ring. The IRGL fixture is used for runway incursion protection and traffic control on taxiways just before active runways. This fixture is suitable for use with Runway Status Light Program (RWSL). They are required for SMGCS operations during low visibility conditions as defined in FAA AC 150/5340-30 and AC 120-57A.These unidirectional lights are designed for use in all wealthier conditions with any kind of control system including the Digitrac Control and Monitoring System.