8. Article

Intensity of lights (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: Range of visibility (luminous range) of light in nautical miles D Luminous intensity of light in candelas for K=0.8 I 1 2 3 4 5 6 0,9 4,3 12 27 52 94 NOTE: The maximum luminous intensity of navigation lights should be limited to avoid undue glare. This shall not be achieved by a variable control of the luminous intensity.