33 C.F.R. § 84.14

Current through May 31, 2024
Section 84.14 - Intensity of lights
(a) The minimum luminous intensity of lights shall be calculated by using the formula:

I = 3.43 * 106 * T * D2 * K-D

Where:

I is luminous intensity in candelas under service conditions,

T is threshold factor 2 * 10-7lux,

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.

(b) A selection of figures derived from the formula is given in the following table (Table 84.14(b)):

Table 84.14(b)

Range of visibility
(luminous range) of light
in nautical miles D
Minimum luminous intensity of light in candelas for K = 0.8 I
10.9
24.3
312
427
552
694

33 C.F.R. §84.14