The RGL4 (Runway Guard Light) is used to enhance the visibility of taxiway holding positions, preventing runway incursions and warning pilots they are approaching an active runway. Two RGL4 fixtures are installed one at each end of the holding position line. Each fixture alternately flashes its two signal heads.
| Compliances | FAA AC 150/5345-46: L-804; EB67B ICAO Annex 14, Fig. A2-25 |
| Fixture Type | 804E4 |
| Input Power | 066 = 6.6 Amp Series Circuit (Mode 1); 024 = 24 VDC (Solar applications, battery pack and solar panel not included, consult factory); 120 = 120 VAC (Mode 2) |
| Options | 1 = External ON/OFF switch, 6.6 A (Standard on voltage model); 2 = Monitoring cable, 5 pin (Standard on voltage model); 3 = Anti-rotation plate for 16-inch diameter baseplate |