They're aftermarket bulbs. They light the road ahead of you. What's more to know?
A lot, actually:
• A headlight contains the bulb(s), reflector, lens and housing. Newer vehicles feature headlights with replaceable bulbs, however earlier vehicles have sealed-beam headlights where the filament, reflector and lens are combined in a single unit.
• Replaceable bulbs are typically twin-filament with a built-in shield that keeps your low and high beams aimed in the right direction. Low=forward and down. High=straight ahead.
• The bulbs should be as small as possible and accurately fitted, otherwise you'll get a random scattering of light. In other words, reduced performance.
• The headlamp lens actually distributes the light. Grooves in the glass function as prisms, deflecting light while reducing brightness.
Interesting facts, although not the end of our aftermarket lighting story.
Read more, or check out other articles in our Lighting Tech library. Then, search by vehicle to see what aftermarket lighting products could enhance your current lighting system.