According to national standards, high-rise buildings whose tops are more than 45 meters above the ground must be equipped with aviation obstruction lights. Aviation obstruction lights are generally divided into three types: low light intensity, medium light intensity and high light intensity. The vertical and horizontal distances of aviation obstruction lights are greater than 45 meters from buildings and their facilities, and the three types of obstruction lights can be used in conjunction with each other.
In order to be different from general-purpose lighting, aviation obstruction lights are not always on but flashing, low-intensity aviation obstruction lights are always on, medium-intensity aviation obstruction lights and high-intensity aviation obstruction lights are flashing, and the flashing frequency is different. Less than 20 beats per minute, not more than 70 beats per minute.
The role of aviation obstruction lights: the role of aviation obstruction lights is to display the outline of the structure, so that the aircraft operator can judge the height and outline of the obstacle and play a warning role.
Classification of aviation obstruction lights:
Below 45 meters above the ground, low-intensity aviation obstruction lights should be set up in open areas around them, always bright red.
Buildings and their facilities above 45 meters above the ground and below 105 meters: use medium-intensity B-type aviation obstruction lights as red flashing lights, the flashing frequency should be between 20-60 times per minute, and the effective light intensity should be 2000cd±25%.
Use medium-intensity A-type aviation obstruction lights 105 meters above the ground and below 150 meters; white flashing, effective light intensity (2000-20000cd) ± 25%.
Buildings and their facilities above 150 meters above the ground use high-intensity obstacle signs and must be white flashing lights. The flashing frequency should be between 20-70 times per minute. The effective light intensity depends on the brightness of the background, and it works 24 hours a day.
Obstacles should mark the high points and edges of the obstacles (ie apparent height and apparent width) with respect to the setting of their obstacle marking lights. Aviation obstacle lights should be set up. Buildings should especially consider adding aviation obstruction lights on the middle floor.
The vertical and horizontal distances of aviation obstruction lights should not be greater than 45 meters (that is, if the top of the object is higher than 45 meters above the ground, an obstruction light must be added in the middle)
For chimneys or other buildings of similar nature, the top obstacle marking light should be located between 1.5-3 meters at the top. Considering the pollution of the chimney to the lamps, the obstacle marking light can be located 4-6 meters below the chimney opening. Ultra-high objects higher than 150 meters should be used in conjunction with medium and high-intensity aviation obstruction lights.