The RELIANCE Runway Threshold and End Inset Light, model L-850D(L), is a robust and advanced 12-inch bidirectional LED inset light designed specifically for runway threshold and end applications. Available in green and red color configurations, this low-protrusion fixture delivers high-performance lighting in line with international aviation standards. It is also offered in a unidirectional version for dedicated runway threshold illumination. Both configurations support integration with RELIANCE’s IQ built-in Individual Lamp Control and Monitoring System (ILCMS), which enhances smart airfield functionality by enabling real-time remote control and diagnostics.
This LED inset light meets or exceeds a wide array of global regulatory standards, ensuring full compliance with FAA AC 150/5345-46, FAA Engineering Brief No. 67, ICAO Annex 14 Volume I, IEC 61827, NATO STANAG 3316, EASA CS-ADR-DSN, Australia MOS 139, Canada TP 312, and French STAC PRO/STAC/SE/ENIS/600S. Such comprehensive certification allows its deployment in diverse international civil and military airfields. Approved for use in ICAO and FAA-compliant applications, the fixture is suitable for runway threshold, runway end, or combined threshold/end lighting needs, depending on configuration.
The RELIANCE L-850D(L) offers outstanding operational efficiency through the use of LED technology that significantly reduces energy consumption and extends operational lifespan. The fixture is available in three configurations: the IQ version with integrated ILCMS intelligence; the Monitored (Mon) version featuring fail-open technology with integrated fuse resistors; and the Non-Mon version for standard operation without monitoring. The IQ model is compatible with RELIANCE Intelligent Lighting 2A systems, allowing for additional energy savings and enhanced lighting control across the airfield. Pulse Width Modulation (PWM) is applied in some versions to optimize LED performance, ensuring consistent light output with no visible flicker.
Engineered for sustainability and durability, the RELIANCE inset light features a fully encapsulated electronic system within a rugged IP68-rated aluminum housing, which is built to withstand extreme weather conditions. All mounting and fastening elements are made of stainless steel, and an optional reinforced prism enhances mechanical resilience. Its modular design allows for quick and easy maintenance, while its compatibility with existing CCR infrastructure—including both 3- and 5-step ferroresonant or thyristor-based regulators—makes retrofitting straightforward and cost-effective.
From a safety perspective, this inset light includes built-in lightning and voltage surge protection to meet rigorous aviation and electrical safety standards. Its low-profile construction helps it resist damage from jet blast and aircraft operations. Fully dimmable and designed to emulate the response curve of legacy halogen systems, the RELIANCE L-850D(L) facilitates seamless transitions in mixed-technology airfield environments. Additionally, the absence of negative slopes in front of the prisms enhances safety and visibility under all operational conditions.
The fixture’s power is supplied via a fully integrated and encapsulated 6.6A electronic converter, ensuring reliable and efficient operation. It includes a standard two-pole L-823 plug for easy connection to compliant transformers. With a power factor typically exceeding 0.95 at 6.6A, this inset light delivers powerful illumination while maintaining excellent electrical efficiency, making it an ideal choice for modern airfield lighting systems.
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