321.420  Number of lamps lighted.
  Whenever a motor vehicle equipped with headlamps as herein required is also equipped with any auxiliary lamps or a spot lamp or any other lamp on the front thereof projecting a beam of an intensity greater than three hundred candlepower, not more than a total of four of any such lamps on the front of a vehicle shall be lighted at any one time when upon a highway.
[C39, §5034.29; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §321.420]

For applicable scheduled fine, see §805.8A, subsection 3