The obstacle lights set up in a large building complex should be able to see the outline of the object from all directions, and the horizontal direction can also be referenced. The obstacle lights should be set up at a spacing of about 45 meters. Generally, buildings should install obstacle lights at the top of the building that are higher than 150 meters in height. High intensity A-type obstacle lights should be set up at the top of the building, and used in conjunction with medium intensity obstacle lights. Tall objects higher than 105 meters but less than 150 meters should be equipped with medium intensity A-type obstacle lights at the top, and obstacle lights should also be added in the middle layer, with the spacing as equal as possible. The ultra-high voltage transmission line tower should be equipped with high intensity B-type obstacle lights and three layers of synchronous flashing. The position is the lowest point of the tower top, the vertical line below the cable, or both.

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.