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§ 29.1393
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, I
1.00
0° to 5°
.90
5° to 10°
.80
10° to 15°
.70
15° to 20°
.50
20° to 30°
.30
30° to 40°
.10
40° to 90°
.05