§ 84.14. Intensity of lights.
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/us/cfr/t33/s§ 84.14·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
(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)): ::: {width="100%"} ::: {.table_head} Table 84.14(b) ::: ::: {.gpotbl_div} 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 ::: :::