14 C.F.R. § 25.1393 — Minimum intensities in any vertical plane of forward and rear position lights.
§ 25.1393 Minimum intensities in any vertical plane of forward and rear position lights. Each position light intensity must equal or exceed the applicable values in the following table: Angle above or below the horizontal plane Intensity, l 0° 1.00 0° to 5° 0.90 5° to 10° 0.80 10° to 15° 0.70 15° to 20° 0.50 20° to 30° 0.30 30° to 40° 0.10 40° to 90° 0.05