Cooling towers are heat rejection devices which extract waste heat to the atmosphere
through the cooling of a water stream to a lower temperature. Cooling towers vary
in size from small roof-top units to very large hyperboloid structures
that can be up to 200 metres (660 ft) tall and 100 metres (330 ft) in diameter.
There is no single standard defining minimum
mandatory requirements governing design and
installation of obstruction lighting; on the other
hand the most common and widespread
regulations are ICAO's and FAA's.