The Rules concerning lights shall be complied with from sunset to sunrise, and during such times no
other lights shall be exhibited, except such lights as cannot be mistaken for the lights specified
in these Rules or do not impair their visibility or distinctive character, or interfere with the
keeping of a proper look-out.the light prescribed by these Rules, If carried , also be exhibited
from sunrise to sunset in restricted visibility and may be exhibited in all other circumstances
when it is deemed necessary.