How often you need to replace the bulbs in your car depends on a few factors. The main factor is what kind of bulbs you have. If you have halogen headlights, they typically last between 450 and 1,000 hours. This means you would need to replace them every 1 to 2 years. LED headlights can last anywhere from 30,000 to 50,000 hours. This means you would only need to replace them every 5 to 7 years. Another factor that will affect how often you need to replace your bulbs is how often you use them. If you only drive during the day, you won't be using your headlights as much and they will last longer. However, if you do a lot of night driving, your headlights will wear out faster. Finally, the environment where you live can also affect how often you need to replace your car's bulbs. If it's dusty where you live, the dust will get on the bulb and cause it to deteriorate faster. So if all these factors are taken into account, replacing your car's headlight bulbs anywhere from once every 1-2 years for halogen bulbs or once every 5-7 years for LED bulbs should suffice