Wyo. Stat. § 31-5-926: Alternate lighting for slow-moving vehicles.

Any motor vehicle may be operated under the conditions specified in W.S. 31-5-910 when equipped with two (2) lighted lamps upon the front thereof capable of revealing persons and objects one hundred (100) feet ahead in lieu of head lamps otherwise required under this act if the vehicle is not operated at a speed in excess of twenty (20) miles per hour.