The FAA advises that steady red obstruction lights be used on towers and communication obstructions from 50-2,200 ft. in height, which can pose a danger to small planes and helicopters at night. Steady red lights are advised up to 150 ft. in height, medium intensity flashing red or white lights up to 350 ft. high, and several levels of lights up to 1750 ft. See the FAA Advisory.
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