What kind of lights? Rope light? Incandescent bulbs? Spot or indirect lighting? This info will help, but short answer is YES, any of these can be replaced with 12 v L E D s.
1)The 1991 Dodge B250, J.Y.D.
Founder & President of Sooner or Later United Truckers and PROUD TO BE A S.L.U.T. ! !