In addition to an all-round white light what light's must power-driven vessels less than 65.6 feet (20 meters) long exhibit when underway between sunset and sunrise?

Power-driven vessels less than 65.6 feet (20 meters) long must exhibit a red and green light on their starboard and port sides, respectively, when underway between sunset and sunrise in addition to an all-round white light. These lights help other vessels determine the direction of travel and avoid collisions.