BICYCLE LIGHTS LAW REQUIRMENTS IN North Dakota
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.
2013 North Dakota Century Code
Title 39 Motor Vehicles
Chapter 39-10.1 Bicycles
39-10.1-07. Lamps and other equipment on bicycles.
1. Every bicycle when in use at nighttime must be equipped with a lamp on the front which emits a white light visible from a distance of at least five hundred feet [152.4 meters] to the front and with a red reflector on the rear of a type approved by the department. A lamp emitting a red light visible from a distance of five hundred feet [152.4 meters] to the rear may be used in addition to the red reflector.
2. Every bicycle must be equipped with a brake which will enable the operator to make the braked wheels skid on dry, level, clean pavement.