These days many cars have LED lights in them, and some of the street rods out there are being retrofitted with LED’s. Of course it’s fine to use LED’s, as they can help update the car’s look and sets it off from the others. But if you do decide to go the LED route, one thing to keep in mind is your flasher can, as it will need to be changed over to a no-load flasher. LED lights use much less power than the older incandescent bulbs and will throw off the flasher can. It will either blink really fast or really slow. A no-load flasher will easily fix this.