33 CFR 84.15 - Intensity of lights.

§ 84.15 Intensity of lights.
(a) The minimum luminous intensity of lights will be calculated by using the formula:
I=3.43×106 ×T×D2 ×K−D
Where
I: Luminous intensity in candelas under service conditions,
T: Threshold factor 2×10−7 lux,
D: Range of visibility (luminous range) of the light in nautical miles,
K: Atmospheric transmissivity. For prescribed lights the value of K will be 0.8, corresponding to a meteorological visibility of approximately 13 nautical miles.
(b) A selection of figures derived from the formula is given in Table 84.15(b):
Table 84.15(b)
Range of visibility (luminous range) of light in nautical miles D Minimum luminous intensity of light in candelas for K=0.8 I
1 0.9
2 4.3
3 12
4 27
5 52
6 94
[CGD 81-008, 46 FR 62447, Dec. 24, 1981, as amended by USCG-2012-0306, 77 FR 37313, June 21, 2012; USCG-2012-0306, 77 FR 42637, July 20, 2012]

Title 33 published on 2013-07-01

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United States Code
U.S. Code: Title 33 - NAVIGATION AND NAVIGABLE WATERS