BICYCLE LIGHTS LAW REQUIRMENTS IN Nebraska
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.
Equipment on bicycles; lights; brakes.
(1) When in use at nighttime, a bicycle shall be equipped with a light visible from a distance of at least five hundred feet to the front on a clear night and with a red reflector on the rear of a type which is approved by the Department of Motor Vehicles or a local authority and which is visible on a clear night from all distances between one hundred feet and six hundred feet to the rear when directly in front of lawful lower beams of headlights on a motor vehicle. A red light visible from a distance of five hundred feet to the rear may be used in addition to such red reflector.
(2) Any bicycle used on a highway shall be equipped with a brake or brakes which will enable the operator to stop the bicycle within twenty-five feet of the point of braking when moving at a speed of ten miles per hour on dry, level, clean pavement.