SIGNALING RANGE OF LAMPS.
| Day. | Night. | |
| 14 cm | 1 to 3 kilometers | 2 to 6 kilometers. |
| 24 cm | 1 to 6 kilometers | 3 to 10 kilometers. |
| 35 cm | 5 to 10 kilometers | 8 to 15 kilometers. |
Signals may be transmitted by using either white or red bulbs, but the range when using red bulbs is reduced approximately 50%.