BICYCLE LIGHTS LAW REQUIRMENTS IN Rhode Island
In US the bike lights die required by Law if you reading in low light conditions, The light can be attached to either the bike or to the cyclist but must be visible at least 500 feet to the front of the bicyde, so be careful how you position the light. Additional lighting must be consistent with the law specifying required lights and reflectors, so a rear light must be red.
Motor and Other Vehicles
Operation of Bicycles
§ 31-19-10. Lamps and other equipment on bicycles.
(a) Front lamp. Every bicycle 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 five hundred feet (500') to the front.
(b) Rear reflector. Every bicycle shall be equipped with a red reflector of a type approved by the division of motor vehicles which shall be visible for six hundred feet (600') to the rear when directly in front of lawful lower beams of head lamps on a motor vehicle. A lamp emitting a red light visible from a distance of five hundred feet (500') to the rear may be used in addition to the red reflector.
(c) Pedal reflectors. No person shall sell a new bicycle or a pedal for use on a bicycle that is not equipped with a reflector of a type approved by the department, on each pedal of the bicycle which is visible from the front and rear of the bicycle during darkness from a distance of two hundred feet (200') nor shall any person operate a bicycle without reflective pedals.