Note: costs mentioned below are given in US dollars as a general point of reference — actual prices vary by country, currency, and local market.
Halogen bulbs last 450-1,000 hours and cost $10-$30 for a DIY swap you can usually do in 10-20 minutes. HID (xenon) and LED assemblies last far longer — 2,000-hours-plus for HID and 15,000-30,000+ hours for LED — but replacement, especially for sealed LED units or HID ballasts, can run $100-$600+ and often needs a shop due to bumper or bracket access. Always replace headlight bulbs in pairs to keep beam brightness and color matched.
At a glance
| Bulb type | Typical lifespan | DIY-friendly? |
|---|---|---|
| Halogen | 450-1,000 hours | Yes, most vehicles |
| HID/Xenon | 2,000+ hours | Sometimes — ballast adds cost/complexity |
| LED | 15,000-30,000+ hours | Varies — many are sealed assemblies |
Know your bulb type before you buy
Check your owner's manual or the bulb's existing base code (commonly H1, H4, H7, H11, or 9005/9006 for halogen). HID systems use a separate igniter/ballast alongside the bulb, and many newer LED headlights are non-serviceable sealed units where you replace the whole housing, not a bulb.
Signs it's time to replace
- One headlight visibly dimmer or more yellow-toned than the other
- Flickering, especially over bumps (loose connector or failing ballast)
- Complete bulb failure — no light at all on one side
- Cloudy or foggy-looking headlight lens reducing output (a lens restoration, not bulb, fix)
- Failed a roadworthiness check for headlight aim or output (MOT in the UK, state inspection in the US, PUC-adjacent checks vary in India)
DIY halogen bulb replacement steps
- Pop the hood and locate the rear of the headlight housing; identify the bulb's twist-lock connector.
- Disconnect the electrical connector, then twist the retaining ring counterclockwise to release the bulb.
- Remove the old bulb without touching the new glass with bare fingers — skin oils shorten halogen bulb life; use a cloth or gloves.
- Insert the new bulb, matching the tabs to the housing slots, twist the retaining ring to lock, and reconnect the electrical plug.
- Test both headlights before closing the hood, and replace the opposite side's bulb at the same time if it's more than a year or two old.
| Job | Typical shop cost (parts + labor) |
|---|---|
| Halogen bulb pair, DIY | $10-$30 |
| Halogen bulb pair, shop-installed | $40-$100 |
| HID bulb + ballast (one side) | $150-$400 |
| Full LED headlight assembly | $300-$600+ |
Never touch a halogen bulb's glass with bare hands — oils create hot spots that cause premature failure or even bulb rupture. If you do, wipe it clean with isopropyl alcohol before installing.
Common mistakes
- Replacing only the failed bulb while the other side is nearly as dim, creating uneven beam output
- Buying a mismatched color-temperature 'upgrade' bulb that looks blue but is illegal for road use in some regions
- Forcing a twist-lock connector — cracked housings are a common self-inflicted DIY cost
- Ignoring headlight aim after replacement, which can blind oncoming traffic or reduce your own visibility
Frequently asked questions
Can I replace a headlight bulb myself?
Why do headlights turn yellow over time?
Should I replace both headlight bulbs at once?
Are LED headlight upgrades legal?
Sources & further reading
- NHTSA — Vehicle Maintenance & Safety
- UK DVSA — Vehicle Maintenance Guidance
- Car Care Council — Be Car Care Aware
Figures, prices and policy details were current at the last-updated date above. Automotive pricing, incentives and regulations change frequently — verify time-sensitive details with the linked primary sources. Read our editorial policy and fact-checking standards.
