Harley Davidson headlights come with factory-installed halogen lights. As time goes by, they tend to reduce performance and this might affect the extent of illumination. That said, you may have to opt for aftermarket LED headlights. Converting from halogen to LED headlights is an easy task. In most cases, you do not need extra tools at all. What you need is just to plug and play. Others, however, require modifications or additional wiring harness to be able to install. Look for the LED headlights that come as a kit where you can also find adapters and other necessary tools needed. I have included such products in my review. The installation manual should help you finish your task of converting the old lights to modern LED options. You can hire a mechanic if you get confused. Also important is to note the size of the stock lights. Most are 7 inches and some are 5.75 inches.