Hawaii Revised Statutes Division 1. Government § 291-31

(a) From thirty minutes after sunset to thirty minutes before sunrise, at any time while a vehicle, other than a bicycle, motorcycle or motor scooter, is operated on any public highway, there shall be displayed at the rear thereof at least two tail lights, spaced as far apart as practicable, which shall display red lights visible not less than two hundred feet from the rear thereof; provided that vehicles manufactured prior to 1968 originally equipped with a single tail light assembly need only display a single tail light; and where a registration number plate is required by law to be carried on the rear thereof, the same shall be illuminated by a white light in such manner that the registration number thereon can be plainly distinguished at a distance of not less than fifty feet from the rear thereof.

(b) From thirty minutes after sunset to thirty minutes before sunrise, at any time while a motorcycle or motor scooter is operated on any public highway, there shall be displayed at the rear thereof, a tail light which shall display a red light visible not less than two hundred feet from the rear thereof; and if a registration number plate is required by law to be carried on the rear of the motorcycle or motor scooter, the same shall be illuminated by a white light in such manner that the registration number thereon can be plainly distinguished at a distance of not less than fifty feet from the rear thereof.