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Code of Federal Regulations Title 33. Navigation and Navigable Waters § 33.84.14 Intensity of lights

Current as of January 02, 2025 | Updated by Findlaw Staff

(a) The minimum luminous intensity of lights shall be calculated by using the formula:

I = 3.43 x 106 x T x D2 x K–D

Where:

I is luminous intensity in candelas under service conditions,

T is threshold factor 2 x 10–7 lux,

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

1

0.9

2

4.3

3

12

4

27

5

52

6

94
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Cite this article: FindLaw.com - Code of Federal Regulations Title 33. Navigation and Navigable Waters § 33.84.14 Intensity of lights - last updated January 02, 2025 | https://codes.findlaw.com/cfr/title-33-navigation-and-navigable-waters/cfr-sect-33-84-14/

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