When did Lights get engaged ?
The highest and lowest of these shapes shall be balls and the middle one a diamond ; when making way through the water , a masthead light or lights , sidelights and a sternlight , in addition to the lights prescribed in sub-paragraph 1 ; when at anchor , in addition to the lights or shapes prescribed in sub-paragraphs 1 and 2 , the light , lights or shape prescribed in Rule 30 .