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Red (L-864) Obstruction lights are used to
increase conspicuity during nighttime. Daytime
and twilight marking is required.
Recommendations on lighting structures can vary
depending on terrain features, weather patterns,
geographic location, and in the case of wind
turbines, number of structures and overall
layout of design.
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Medium intensity flashing white (L-865)
obstruction lights may provide conspicuity both
day and night. Recommendations on lighting
structures can vary depending on terrain
features, weather patterns, geographic location,
and in the case of wind turbines, number of
structures and overall layout of design.
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This dual lighting system includes red lights
(L-864) for nighttime and medium intensity
flashing white lights (L-865) for daytime and
twilight use. There may be some areas where the
use of medium intensity at night may cause some
populated environmental concerns and the use of
the dual lighting system should reduce/mitigate
concerns.
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Lighting with high intensity (L-856) flashing
white obstruction lights provides the highest
degree of conspicuity both day and night.
Recommendations on lighting structures can vary
depending on terrain features, weather patterns,
geographic location, and in the case of wind
turbines, number of structures and overall
layout of design.
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When a structure lighted by a high intensity
flashing light system is topped with an antenna
or similar appurtenance exceeding 40 feet (12m)
in height, a medium intensity flashing white
light (L-865) should be placed within 40 feet
(12m) from the tip of the appurtenance. This
light should operate 24 hours a day and flash
simultaneously with the rest of the lighting
system.
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This dual lighting system includes red lights
(L-864) for nighttime and high intensity
flashing white lights (L-856) for daytime and
twilight use. This lighting system may be used
in lieu of operating a flashing white lighting
system at night. There may be some populated
areas where the use of high intensity lights at
night may cause significant environmental
concerns and complaints.
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Aviation Red Obstruction Lights are used to
increase conspicuity during nighttime.
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