Text in force at 25-153: from 25-0, effective 1 Feb 1965.
(a) Each landing light must be approved, and must be installed so that--
(1) No objectionable glare is visible to the pilot;
(2) The pilot is not adversely affected by halation; and
(3) It provides enough light for night landing.
(b) Except when one switch is used for the lights of a multiple light installation at one location, there must be a separate switch for each light.
(c) There must be a means to indicate to the pilots when the landing lights are extended.
29 FR 18291 · Source