Unless you got the sealed beam type assembly that requires no bulb, there's simply no way you'd be able to use your car's headlight assembly without the headlight bulb . As you probably already know, this component is covered by the headlight lens and fits in the middle of the parabolic reflector. It is held in place by the bulb socket, which also connects it to the wire harness and to the power supply.
Your headlamp assembly allows you to see the road ahead when driving at night, during a heavy rain, when the fog is heavy, and other low-visibility conditions. With your car headlamp's function, it should not be difficult for you to determine if one of your headlight bulbs is not working properly anymore. Symptoms of bulb damage are as simple as the failure of the headlight to light up, burn marks on the inside of the bulb head, and a significant decrease in beam brightness even if your headlights are set on High.
Should you have your headlamp bulb give up on you, the only solution is to get a replacement. Now, when replacing a headlamp bulb, you can't just get the first bulb you get your hands on. Different applications require different types of bulbs. So to determine your ride's headlight bulb specifications, you can look at your car owner's manual. If you don't have it, you can simply look at the metal stem of your old bulb for the tiny markings, which usually indicate the voltage of the bulb. And if you got eye problem, well, what else should you do but bring your old bulb to the parts store for comparison?
That doesn't mean, however, that you can't use other kinds of headlights anymore. See, there are many headlamp bulbs in the market, and they're there to give you more choices. It's just a matter of choosing the right car headlight bulb for your desired application. If all the driving you do is in the city, then perhaps conventional bulbs are adequate since city roads and streets are generally well-lighted even at night. And then there's also wet weather driving. Bulbs suited for this stand out with their golden colored beams. The reason they're colored such is that yellow light penetrates through rain and fog quite well. So if you're going to do a lot of wet weather driving, or you're thinking of roughing it out off-road in your SUV, then all-weather bulbs are your safest bet.
But when it comes to the most popular bulb type, there's always the high-intensity discharge (HID) headlight bulb. This type of bulb emits the brightest beam possible at less energy expense. This is made possible using a ballast that converts low-voltage DC current into high-voltage AC current to produce a spark internally-allowing HID bulbs to produce twice the power output of conventional bulbs. To find your preferred bulb type, browse only Parts Train catalog!