Here ya go Directly from the DNR website :
Legal Artificial Light:
Only lights similar to the type ordinarily held in the hand or on the person may be used. An artificial light, including laser sights, of the type ordinarily held in the hand or on the person may be mounted on a person's clothing or firearm. Spotlights, floodlights, vehicle headlights and other artificial lights not similar to the type ordinarily held in the hand or on the person are illegal. The use of natural light, including night vision optics and scopes, is legal.
Good Luck-
Ben VW