Heat-resistant LEDs incorporate oversized aluminum heat sinks, ceramic circuit boards, and in some cases, active cooling fans or liquid-cooled channels. These design elements ensure the LED's junction temperature stays within operational limits, even when ambient temperatures soar. This Advisory Circular (AC) contains the Federal Aviation Administration (FAA) specifications for light fixtures to be used on airport runways and taxiways. Heat-resistant (up to 65°C) and sensor-pluggable for adaptive. MIL-C-7989 Our L810LED omni-directional, red, steady-burning obstruction light is designed for marking tall structures such as buildings, towers, masts, cranes, meteorological towers, chimneys and other hazards to aircraft. This energy-saving LED light is a direct replacement for incandescent. This engineering brief provides additional requirements for "Light Sources Other Than Incandescent and Xenon for Airport and Obstruction Lighting Fixtures" subject to certification under AC 150/5345-53, Airport Lighting Equipment Certification Program, and/or other applicable documents. One standard goes as following (From FAA AC 150/5345-43H): 4. The equipment must be subjected to a constant temperature of +130F.