page_title: Aircraft warning lights
section_title: Use and positioning
hierarchical_section_title: Aircraft warning lights / Use and positioning
caption_attribution_description: English: Mast atop the tower for WRLF (FM) and WTCS (AM) in Fairmont, West Virginia, showing the two bay circularly polarized FM antenna for WRLF.
context_page_description: Aircraft warning lights are high-intensity lighting devices attached to tall structures as collision avoidance measures. Such devices make structures more visible to aircraft, and are usually used at night, although they may be used during the day. These lights need to be of sufficient brightness to be visible for miles around the structure.
context_section_description: These lights can generally be found attached to any tall structure such as broadcast masts and towers, water tanks located on high elevation, electricity pylons, chimneys, tall buildings, cranes and wind turbines. Shorter structures that are located close to airports may also require lighting; an example of such is the south scoreboard at Lambeau Field in Green Bay, Wisconsin built in 2013, which is the tallest structure in the general area of nearby Austin Straubel International Airport. The International Civil Aviation Organization (ICAO) sets standards, usually adopted worldwide, for the performance and characteristics of aviation warning lamps. 
  Lights are usually arranged in clusters of two or more around the structure at specific heights on the tower. Frequently there will be a set at the top, and then one or more sets equally spaced down the structure. The United Kingdom's Belmont mast has nine clusters of red lamps spaced equally along the full height of the mast.
caption: Warning light at 216 feet (66 m) atop the WRLF FM antenna
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