All lights are 12 volt. Our selection of incandescent lights is great for truckers who are on the go and often need to replace a light before DOT finds out. We stock most of the same sizes as our LED light line, with a few exceptions for lights that we just don't have any demand for. As technology improves, a lot of our LED light options are just as cheap as their incandescent counterparts. Plus, LED lights last several times longer than incandescent lights and the multi-diode styles mean that even if one diode burns out, you'll still have several more to keep the light visible. For some drivers, though, incandescent lights are preferable because they've been around forever. Whatever your preference, we can set you up!