§ 84.14 — Intensity Of Lights

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

I = 3.43 × 10

6 × T × D

2 × 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)