We use J.W. Speaker accessory lights on our units. You can get them at any tractor supply store, like Tractor Supply or your implement dealer. They aren't cheap, but they will take a beating and they are vibration resistant. They come in flood, spot and trapezoidial beam design. As we use them in our ag/haying operation, I like the fact that they have never let us down. They have a nice adjustable mount and are well built and made in the United States.