337.15  LIGHTS OF LESS INTENSITY ON SLOW-MOVING VEHICLES.
   (a)   Any motor vehicle may be operated under the conditions specified in Section 337.02 when it is equipped with two lighted lights upon the front thereof capable of revealing persons and substantial objects seventy-five feet ahead in lieu of lights required in Section 337.13, provided that such vehicle shall not be operated at a speed in excess of twenty miles per hour. 
   (b)   Whoever violates this section is guilty of a minor misdemeanor on a first offense; on a second offense within one year after the first offense, the person is guilty of a misdemeanor of the fourth degree; on each subsequent offense within one year after the first offense, the person is guilty of a misdemeanor of the third degree.  (ORC 4513.16)