Aviation obstacle lights are generally divided into low light intensity, medium light intensity and high light intensity three, aviation obstacle lights to the vertical and horizontal distance of more than 45 meters of the building and its facilities, can be three kinds of obstacle marking lights used in conjunction with each other. Classification of aviation obstacle lights
Below 45 metres from the ground, the surrounding open space should be set up low light intensity aviation obstacle lights, constant red light.
Buildings and their facilities above 45 metres and below 105 metres above ground level: medium intensity B-type aviation obstacle lights with red flashing light, flashing frequency should be between 20-60 times per minute, effective light intensity of 2000 cd ± 25%.
Above 105 m and below 150 m from the ground: medium intensity A type aviation obstacle lights; white flashing, effective light intensity (2000-20000 cd) ± 25%.