car headlight bulb types

Car headlight bulb types (and what they mean)

Headlight bulb names can look like a random code: H11, 9005, D2S… but there’s logic behind it. Here’s the quick, friendly breakdown.

1) Halogen bulbs

These are the most common in older and many mid-range vehicles. Examples include H11, H7, 9005, 9006. They’re usually affordable and easy to replace.

2) HID / Xenon bulbs

Often found in projector housings. Common types: D1S, D2S, D3S, D4S. They require a ballast and have a distinct “warm-up” when turned on.

3) LED headlights

Some cars have factory LED modules (not replaceable as a simple bulb), while others can accept LED replacement bulbs. Fit doesn’t guarantee good beam pattern – housing design matters.

Low beam vs high beam

Some cars use the same bulb for both (with a shutter in a projector), others use two separate bulbs. Always confirm by position.

How to confirm your type

• Check your owner’s manual
• Look at the bulb marking
• Check the headlight housing label

If you share your car info, I can help identify the exact bulb type for each position.