When to replace?
If one bulb's gone or fading, the other won't be far behind. So replace both bulbs at the same time. For many vehicles these days, one bulb serves for both high and low beams. In older models, however, two separate headlight bulbs were used on both sides. Either replaces both bulbs and all four bulbs at the same time for a consistent field-of-vision down-road.
Why you should replace:
Dimming or burned out headlight bulbs mean you can't see the road and other drivers can't see you. It's a recipe for danger. It can mean a costly ticket from your local authorities if you don't get them fixed. Besides, there are plenty of options for improved visibility these days, including LED and Xenon bulbs. Even changing out your old halogen headlights for newer models can provide 30 percent brighter light and up to 25 percent more down-road visibility.
Which is good headlight for car?
The three main factors in selecting new headlights are:
2. Whiteness (or color temperature)
Halogen light bulbs come standard on most vehicles, but increasingly carmakers are turning to Xenon and LED bulbs for improved visibility. Then select the bulbs that will give you the best visibility and value for your needs.
You can also consider upgrading your headlights to Xenon, if they don't come standard on your vehicle. Xenon lights have a distinctive white or bluish-white glow and are regarded as the ultimate in visibility and luxury. You'll need to install a Xenon conversion kit, however, which will take a few hours.
Kinds of headlights:
Vehicles come standard with a specific type of headlight. Common types include halogen, LED, and Xenon (or HID). Most vehicles come with halogen headlights. Here are the differences between them:
Halogen: Halogen headlights use a tungsten-halogen filament mixed with halogen gas to generate a much brighter light than conventional headlights.
LED: LEDs have an advantage over halogen in that they draw less power to operate run cooler than halogen lights, and last longer.
Xenon/HID: Xenon lights are brighter, have a lower operating temperature, and last longer. But replacing HID headlights will set you back a pretty penny compared to other options and may require professional installation.