§ 84.14 Intensity of lights.
Primary source
Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.
Full Text
(a) The minimum luminous intensity of lights shall be calculated by using the formula:
(b) A selection of figures derived from the formula is given in the following table (Table 84.14(b)):
62−DI = 3.43 × 10 × T × D × K
Where: I is luminous intensity in candelas under service conditions, −7T is threshold factor 2 × 10lux, D is range of visibility (luminous range) of the light in nautical miles, K is atmospheric transmissivity. For prescribed lights the value of K shall be 0.8, corresponding to a meteorological visibility of approximately 13 nautical miles.
bTable 84.14()Range of visibility(luminous range) of lightin nautical miles DMinimum luminous intensity of light in candelas for K = 0.8 I 10.9 24.3 312 427 552 694
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