What are the specific requirements for high-mast lighting at airports?
High-mast lights at airports are primarily used for aprons, cargo areas, maintenance hangars, and similar zones. Key requirements include:
1. Aviation Obstruction Lights: If the mast height exceeds 45 meters (or the obstacle limitation surface defined by the airport), red aviation obstruction lights (low or medium intensity) must be installed and integrated into the airport's obstruction lighting system.
2. Glare Control: Luminaires must not cause glare for pilots, particularly along approach and takeoff flight paths. Full cut-off luminaires should be used, and aiming angles must be precisely adjusted.
3. Color Temperature: 5000K is recommended to ensure distinction from runway and taxiway lighting (which is typically blue or yellow).
4. Flicker-Free Operation: Systems must meet requirements for non-interference with high-speed cameras and ground radar; the driver's PWM frequency should exceed 3000 Hz.
5. Reliability: Apron lighting failures can impact flight punctuality; therefore, luminaires and drivers must have a high MTBF (Mean Time Between Failures) and be equipped with backup power supplies.
6. Electromagnetic Compatibility (EMC): High-mast lights must not interfere with airport communication, navigation, or radar systems. EMC test reports are required.
7. Corrosion Resistance: Chemicals such as de-icing fluids, aviation fuel, and oil residues can corrode lighting equipment; housings must be chemically resistant.
8. Installation Height: Apron high-mast lights typically range from 25 to 40 meters in height and must be positioned to avoid obstructing the view from the control tower.
9. Color: Masts are usually painted with alternating orange and white bands—or in colors specified by the airport—to enhance visibility. High-mast lighting projects at airports generally require the involvement of specialized civil aviation design institutes and must pass acceptance inspections by the civil aviation authority.
