Bully offers their aftermarket hitch lights in two different varieties. They sell both incandescent hitch lights and the more modern LED hitch lights. Choosing between the two is down to your preferences and budget.
Incandescent bulbs are the traditional variety and are the least expensive. They are the most widely spread and work in a variety of applications. They are the standard bulb that is offered in Bully aftermarket hitch lights. However, they do have some drawbacks. They are less efficient and tend to burn out much quicker and require replacement more than the more modern varieties of bulbs. However, the standard incandescent bulbs emit a more soothing light which is less sharp than what LEDs emit.
LED bulbs on the other hand are a more modern type of light and offer less drawbacks. They are now used in a wide array of products including aftermarket hitch lights. They are very long lasting and are incredibly efficient. However, they do cost a bit more than a standard incandescent bulb. They also offer a sharper light that is very visible at night or in inclement weather. If you can afford them, you should definitely go with the Bully LED Hitch Brake Lights.