A. For just $20 to $50 total, you can find LED replacement headlight bulbs that’ll fit perfectly into various LED headlight housing units. These reasonably priced products are easy to install, energy-efficient, and they can provide decently long lifespans. If you’re looking for more premium products, or LEDs that are more powerful, you can expect to spend between $50 and $75. And if you’re looking for total LED headlight housing that will make your new LED bulbs legal on the road, you can expect to spend around $100 for a pair.