Because according to regulations, buildings and their facilities need to be 45 meters above the ground and 105 meters below the ground. The medium-intensity type B aviation obstruction light is a red flash. The flash frequency should be between 20-60 times per minute, and the effective light intensity is 2000cd±25%.
Use medium-intensity A-type aviation obstruction light at 105 meters above the ground and below 150 meters; white flashing, effective light intensity (2000-20000cd) ± 25%.
In buildings and facilities above 150 meters from the ground, use high-intensity obstruction lights and must be white flashing lights. The flash frequency should be between 40-60 times per minute. The effective light intensity depends on the background brightness (2000-200000cd), all weather Work 24 hours.
In this way, the pilot can determine the height of the high-rise building on the ground according to the color and frequency of the light, which can effectively avoid it and avoid collision.
For example, in addition to red obstruction lights at regular intervals around the tower body, flashing aviation signs are also installed on the top of the TV tower. It emits 200,000 candles during the day, 100,000 candles in the evening, and 2,000 candles in the dark. It is automatically controlled by photoelectric in three levels. At the same time, it flashes at 40 times per minute, which is particularly eye-catching to increase the height of the pilot's building. Therefore, it is very important to install aviation obstruction lights in high-rise buildings.