An approach lighting system (ALS) is a lighting system installed on the approach end of an airport runway and consisting of a series of lightbars, strobe lights, or a combination of the two that extends outward from the runway end.
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The FAR that deals specifically with aircraft lights, § 91.209(b), provides that no person may “operate an aircraft that is equipped with an anticollision light system, unless it has lighted anticollision lights.” There is an exception allowing the pilot-in-command to determine that, “in the interest of safety,” ...
In the United States, for example, landing lights are not required or used for many types of aircraft, but their use is strongly encouraged, both for take-off and landing and during any operations below 10,000 feet (3,000 m) or within ten nautical miles (19 km) of an airport (FAA AIM 4-3-23).