FAA Requirements for Red Obstruction Lights on Tall Structures (6/22/2026)

Red obstruction lighting systems are one of the most commonly used methods for identifying towers, utility structures, wind turbines and other elevated objects.

Article - June 22, 2026 By LarsonElectronics.com

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FAA Requirements for Red Obstruction Lights on Tall Structures

The Federal Aviation Administration (FAA) establishes specific requirements for obstruction lighting to ensure that tall structures are visible to pilots operating an aircraft during nighttime and low-visibility conditions.

Red obstruction lighting systems are one of the most commonly used methods for identifying towers, utility structures, wind turbines and other elevated objects that penetrate navigable airspace.

Applications

Red obstruction lights are intended for nighttime operation. Unlike white strobe systems that provide daytime visibility, red lighting systems are designed to warn aircraft operators after sunset and during periods of darkness.

Tall structures require multiple lighting levels to adequately define their vertical profile. FAA guidance specifies that intermediate lighting systems be installed at prescribed intervals along the structure's height. These intermediate levels may consist of flashing red beacons, steady-burning marker lights or combinations of both.

Height Requirements and Light Configurations

For structures approximately 150 feet AGL (above ground level) or less, the FAA may permit the use of steady-burning red obstruction lights designated as L-810 fixtures. These lights are mounted near the highest point of the structure and arranged to provide 360-degree visibility. The installation includes at least two fixtures to ensure that one light remains visible regardless of the aircraft's approach direction.

As structure height increases, the FAA requires more comprehensive lighting configurations. Structures taller than 150 feet AGL generally require an L-864 flashing red beacon mounted at the highest point. The L-864 beacon emits a flashing red signal that serves as a warning light for pilots. FAA standards specify flash rates and intensity levels to ensure consistent visibility and recognition. The beacon must be positioned to provide an unobstructed line of sight from all directions around the structure.