The obstacle is set such that its obstacle light should indicate the highest point and the most edge of the obstacle (ie, the height and the width of the eye). One or more low, medium or high intensity obstacle lights must be placed as close as practicable to the top of the object.
The top barrier light must be arranged to at least show the highest or highest edge of the object relative to the obstacle limiting surface. However, in actual use, due to the consideration of lightning protection, it is generally about 1 to 3 meters indented according to the height. For chimneys or other structures of similar nature, the top lamp should be placed at a position low enough below the top to minimize contamination by smoke or the like. Generally 3 to 5 meters lower.
If the top of the object is more than 45 meters above the ground, an obstacle light must be added to the middle layer. The distance between each obstacle light must be no more than 45 meters and be as equal as possible (the ultra-high buildings in the city are more than 100 meters high. It is necessary to consider adding an obstacle light to the middle layer). When building a barrier lamp in the middle of a building located near a city or a residential area, consideration should be given to avoiding glare. It is generally required to see only the scattered light from the ground. When the top of the obstacle marked by the B-type medium-intensity obstacle light is 45 meters higher than the top elevation of the surrounding ground or nearby buildings (when the obstacle is surrounded by multiple buildings), an obstacle light must be added in the middle. The additional intermediate barrier lights must be alternating B-type low-intensity obstacle lights and B-type medium-intensity obstacle lights and, as the case may be, no more than 52 m between the top obstacle lights and the top of the ground or nearby buildings. Isometric setting; the top of the obstacle marked by the C-type medium-intensity obstacle light must be added in the middle when the top of the obstacle is more than 45 m higher than the top level of the surrounding ground or nearby buildings (when the obstacle is surrounded by multiple buildings) Obstacle light. The additional intermediate barrier lights must be placed at an equidistance of no more than 52 meters between the top barrier lights and the ground or the top of the nearby building as appropriate.