Every moped, when in use at nighttime, shall be equipped with a lamp on the front which shall emit a white light visible from a distance of at least 500 feet to the front, and with a red reflector on the rear of a type approved by the Department which shall be visible from all distances from 100 feet to 600 feet to the rear when in front of lawful, low-powered beams of head lamps on a motor vehicle. A lamp emitting a red light visible from a distance of 500 feet to the rear may be used in addition to the red reflector.