The Civil Aviation Administration has unified specifications for the types and settings of aviation obstruction lights. Medium-intensity aviation obstruction lights will be subdivided into two types according to the situation. They are Type A and Type B. The main difference between the two is the light source. Different colors have differences in light intensity. According to the regulations of the Civil Aviation Administration of China, Type A medium intensity obstruction lights must be white flashing lights, while Type B has red flashing lights. Both are usually used together according to the situation:
a. The medium-intensity A-type obstruction light is a white flash with an effective light intensity of 20000cd-2000cd. It is used for buildings and facilities above 105 meters and obstacles with strong background light or used with high-intensity B-type light dimming.
b. Medium-intensity B-type obstruction lights are red flashes with an effective light intensity of 2000cd±25%. They are used in buildings and facilities below 105 meters or used in conjunction with medium-intensity A-type and high-intensity A-type obstruction lights.