In our white rock lights, each light has a 6' lead wire between the main controller (that you typically install in the engine bay near the battery) and the light. Depending on which vehicle you have (full size truck vs Jeep Wrangler for example) you may need longer than 6'. Use these plug and play 6' extensions to get a full 16' wire lead from controller to light.
You will need 2 of these extensions depending on the location you want to mount your rock lights for example, if you are installing two lights near the rear of a full sized pickup truck or mounting them on the upper back end of your vehicle, you would need 2 of these extensions (one per light).
looking for LED rock lights find them here at ExtremeLED!
6ft extension wires available