Halogen vs LED vs HID Headlights
Reviewed by GarageDex editorial
Halogen bulbs are the cheapest and simplest to replace but the dimmest and shortest-lived. LED bulbs are the brightest, most efficient, and longest-lasting. HID (xenon) bulbs are bright and white but need a ballast and warm-up. The key rule: replace with the type your car was built for, and always match the correct bulb size for your vehicle.
How the three headlight technologies compare:
| Halogen | LED | HID | |
|---|---|---|---|
| Brightness | Lowest | Highest | High |
| Lifespan | ~1 year | 10,000+ hrs | ~3-5 years |
| Light color | Warm yellow | White/cool | White/blue |
| Cost | Cheapest | Higher | Mid-high |
| Needs ballast? | No | No | Yes |
| Ease of DIY | Easy | Easy-moderate | Moderate |
Halogen
A tungsten filament in halogen gas. Cheap, sold everywhere, and a five-minute swap on most cars, but it is the dimmest option and usually lasts about a year. Codes like H11, 9005, and H7 are halogen sizes.
LED
Light-emitting diodes: instant-on, very efficient, and rated for tens of thousands of hours - often the life of the car. Many newer vehicles use sealed LED units that are not user-replaceable.
HID / xenon
An electric arc through xenon gas, run by a ballast. Bright and white, common on 2000s-2010s luxury cars, but more complex to service than halogen or LED.
The rule that matters
Match the bulb size your car uses and, ideally, the technology your housing was designed for. Look up the exact bulb sizes for your vehicle.
Frequently asked
Are LED headlight bulbs legal?
Factory LED headlights are legal. Aftermarket LED bulbs dropped into a halogen reflector housing are a gray area - they can be legal if they meet beam-pattern and brightness rules, but a poorly designed kit that blinds oncoming drivers is not. Projector housings handle LED conversions best.
Can I replace halogen with LED?
Often yes, if you buy an LED bulb in your vehicle's correct size and your housing produces a clean beam pattern. Quality matters - cheap LED kits can scatter light and fail emissions/inspection.
Which is brightest - LED or HID?
Modern automotive LEDs match or exceed HID output while turning on instantly and lasting far longer. HID still produces a lot of light but needs a ballast and a few seconds to reach full brightness.
Need your car's exact spec? Find your car's bulb sizes →