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Title 33: Navigation and Navigable Waters
CHAPTER I: COAST GUARD, DEPARTMENT OF HOMELAND SECURITY
SUBCHAPTER E: INLAND NAVIGATION RULES
PART 84: ANNEX I: POSITIONING AND TECHNICAL DETAILS OF LIGHTS AND SHAPES
84.15 - 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?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):
| 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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