When operating between the hours of one-half hour after sunset and one-half hour before sunrise, every vessel shall carry the lights as required by BMC 12.12.050 and 12.12.060, and during such time, no other lights which may be mistaken for the prescribed lights may be shown. Except as otherwise provided, every white light prescribed by this chapter shall be of such character as to be visible at a distance of at least one mile. Every colored light prescribed by this section shall be of such character to be visible at a distance of at least one mile. The word “visible” in this section shall mean visible on a dark night with a clear atmosphere. [Ord. 8655 § 3(D), 1978].