For chimneys or other similar buildings, the top obstacle marker light should be located between 1.5 and 3 meters above the top. Considering the pollution of the chimney on the lighting fixtures, the obstacle marker light can be located 4 to 6 meters below the chimney opening. Ultra high objects above 150 meters should be used in conjunction with medium and high intensity aviation obstruction lights.

Aviation obstruction lights, also known as navigation aid lighting equipment, are special lighting fixtures that identify obstacles and belong to the aviation aid lighting equipment industry. Aviation obstruction lights are the types of lights under their seats. In order to distinguish it from general purpose lighting, aviation obstruction lights are not always on but flashing, low intensity aviation obstruction lights are always on, medium intensity aviation obstruction lights and high intensity aviation obstruction lights are flashing, with a flashing frequency of not less than 20 times per minute and not more than 60 times per minute. The function of aviation obstacle lights is to display the contour of structures, enabling aircraft operators to determine the height and contour of obstacles, serving as a warning.