RSA 266:37 Spot Lamps and Auxiliary Lamps.

I. Any motor vehicle may be equipped with not to exceed 2 spot lamps and every lighted spot lamp shall be so aimed and used that no part of the high intensity portion of the beam will strike the windshield, or any windows, mirror, or occupant of another vehicle in use, except that a spot lamp may be used by a police officer to illuminate the interior of a vehicle being stopped from the rear.
II. Except as provided in paragraph II-a, any motor vehicle may be equipped with not to exceed 3 auxiliary driving lamps mounted on the front at a height not less than 12 inches nor more than 42 inches above the level surface upon which the vehicle stands, with such measurements to be made from the ground to the center of the lens, except that vehicles while used in the winter maintenance