Text in force at 23-63: from 23-49, effective 11 Mar 1996.
[Each taxi and landing light must be designed and installed so that:
(a) No dangerous glare is visible to the pilots.
(b) The pilot is not seriously affected by halation.
(c) It provides enough light for night operations.
(d) It does not cause a fire hazard in any configuration.]
61 FR 5169 · Source