33 C.F.R. § 84.15 Intensity of lights.
Title 33 - Navigation and Navigable Waters
(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 2×10−7 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 Table 84.15(b):
Title 33: Navigation and Navigable Waters
PART 84—ANNEX I: POSITIONING AND TECHNICAL DETAILS OF LIGHTS AND SHAPES
§ 84.15 Intensity of lights.
Table 84.15(b)------------------------------------------------------------------------ Minimum luminous intensity of Range of visibility (luminous range) of light in light in nautical miles D candelas for K=0.8 I------------------------------------------------------------------------1..................................................... 0.92..................................................... 4.33..................................................... 124..................................................... 275..................................................... 526..................................................... 94------------------------------------------------------------------------
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