Wisconsin Statutes Vehicles (Ch. 340 to 351) § 347.115. Modulating headlamps for motorcycles, motor bicycles or mopeds

A motorcycle, motor bicycle or moped may be equipped with and use a means of modulating the upper beam of the headlamp between a high and a lower brightness at a rate of 200 to 280 changes per minute. A headlamp may not be modulated during hours of darkness.