14 C.F.R. § 27.1391
Each position light intensity must equal or exceed the applicable values in the following table:
| Dihedral angle (light included) | Angle from right or left of longitudinal axis, measured from dead ahead | Intensity (candles) |
|---|---|---|
| L and R (forward red and green) | 10° to 10°10° to 20°20° to 110° | 40305 |
| A (rear white) | 110° to 180° | 20 |