N.H. Rev. Stat. Ann. § 266:86

Every bicycle operated upon any way during darkness shall be equipped with a lamp emitting a white light visible from a distance of 300 feet in front of the bicycle and with a red reflector on the rear of a type approved by the director, which shall be visible from a distance of 300 feet to the rear when directly in front of the lawful upper beams of headlamps on a motor vehicle. A lamp emitting a red light visible from 300 feet to the rear may be used in addition to the red reflector. Every moped driven upon any way during darkness shall be equipped with one headlamp which meets the specifications for headlamps established in RSA 266:31. Taillamps and stop lamps are required on mopeds.