For high-voltage transmission cables and towers less than 150 meters high, medium intensity aviation obstruction lights emitting white light can be installed at the top. Regardless of the type of aviation obstacle light, the number and arrangement of aviation obstacle lights at different heights should be able to see the object or its "group outline" from all aspects, and consider the simultaneous and sequential flashing of obstacle marker lights to achieve a clear warning effect.

Aviation obstacle lights are generally divided into three types: low intensity, medium intensity, and high intensity. The vertical and horizontal distances of aviation obstacle lights for buildings and their facilities are greater than 45 meters, and the three types of obstacle sign lights can be used in conjunction with each other. Aviation obstacle indicator lights should be classified as below 45 meters above the ground, and low light intensity aviation obstacle lights should be installed in relatively open areas around them, with a constant red light. Buildings and facilities above 45 meters and below 105 meters above the ground: In use, the B-type aviation obstacle light with moderate intensity is a red flashing light, with a flash rate of 20-60 times per minute and an effective light intensity of 2000cd ± 25%. Use medium intensity A-type aviation obstruction lights above 105 meters and below 150 meters above the ground; White flashing, effective light intensity (2000-20000cd) ± 25%. Buildings and their facilities above 150 meters above the ground must use high intensity obstacle sign lights and must be white flashing lights, with a flash rate of 20-70 times per minute. The effective light intensity depends on the background brightness and operates 24 hours a day.

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