FAA Federal Aviation Regulations (FARS, 14 CFR)

No position light intensity may exceed the applicable values in the following equal or exceed the applicable values in §23.1389(b)(3):

------------------------------------------------------------------------
Maximum intensity
-----------------------
Overlaps                        Area A      Area B
(candles)   (candles)
------------------------------------------------------------------------
Green in dihedral angle L.......................          10           1
Red in dihedral angle R.........................          10           1
Green in dihedral angle A.......................           5           1
Red in dihedral angle A.........................           5           1
Rear white in dihedral angle L..................           5           1
Rear white in dihedral angle R..................           5           1
------------------------------------------------------------------------

Where --

(a) Area A includes all directions in the adjacent dihedral angle that pass through the light source and intersect the common boundary plane at more than 10 degrees but less than 20 degrees; and

(b) Area B includes all directions in the adjacent dihedral angle that pass through the light source and intersect the common boundary plane at more than 20 degrees.

[Doc. No. 4080, 29 FR 17955, Dec. 18, 1964, as amended by Amdt. 23-43, 58 FR 18977, Apr. 9, 1993]