Automotive Bulbs – Halogen, LED and Xenon — Page 10

The “Car Bulbs” section brings together bulbs for OEM headlight units and auxiliary lighting: halogen, LED, and xenon, as well as in-headlight LED modules, CANbus adapters, and mounting adapters. Osram, Philips, Narva, and Niken bulbs include the base type, wattage, and voltage on the product page, so it’s easy to match the right model to your old bulb.

How to choose a bulb for your vehicle

You don’t choose a bulb by car make—you choose it by function and the base type installed in the specific lamp housing. In one vehicle, low beam, high beam, and fog lights often use different bases, and even within the same model there can be different headlight versions, so the model year or VIN alone may not be enough.

1. Check the marking on the old bulb — H4, H7, H11, HB3, etc. are stamped on the base or flange.
2. Check the owner’s manual — the bulb type for each light is listed in the bulb replacement section.
3. Pay attention to voltage — passenger cars use 12 V, trucks and buses use 24 V; bulbs with different voltage ratings are not interchangeable.
4. For LED upgrades in an OEM headlight confirm whether you need a CANbus adapter: on many modern cars, without it the onboard computer shows an error or the bulb may flicker.

Bases are not interchangeable: H4, H7, and H8 have different fitment and contacts, and a factory xenon headlight cannot be replaced directly with a halogen bulb. If the marking is worn off or you’re unsure, send us a photo of the old bulb and the headlight, or message us the car make, model, and year—we’ll help you identify the correct base.

Headlight bulbs by base type

• H4 — two filaments in one bulb: low and high beam in one headlight.
• H7 — one of the most common low- or high-beam bulbs used in projector and reflector headlights.
• H11 and H8 — often used in fog lights and low beam.
• HB3 and HB4 (9005 and 9006) — common in Japanese and American vehicles.
• 9012 (HIR2) — low beam on some modern models.
• H1, H3, and H27 — high beam, fog lights, and auxiliary lights.

Halogen, LED, or xenon: what’s the difference

• Halogen bulbs — the OEM solution for most headlights, warm light at 3000–3700 K that illuminates wet asphalt well. Upgraded series such as Osram Night Breaker provide a longer, brighter beam without modifying the headlight.
• LED bulbs — bright white light, lower power consumption, and longer service life. It’s important that the LEDs sit where the filament used to be—then the headlight forms a correct cutoff and won’t dazzle oncoming traffic. Matching the base is not enough for LED: the bulb must lock securely in the socket, its heatsink or fan must fit under the headlight cap, and the car’s electronics must accept the lower wattage.
• Xenon bulbs — for headlights designed for xenon with a ballast (D-series bases). Replace them in pairs so the color matches.
• In-headlight LED modules — projector modules installed instead of the factory reflector; this is a headlight retrofit, not a simple bulb swap.

Before switching from halogen to LED or xenon, check your country’s regulations regarding changes to the light source in headlights.

Bulbs by application

• Headlights (low and high beam) — the main beam that determines how far you can see the road at night.
• Fog lights (“fog lamps”) — a wide, flat beam under the fog layer; warmer light works better here because it reflects less from droplets. If the fog light uses a replaceable bulb, it’s changed like a regular bulb; in a lamp with a built-in LED module there is no separate bulb. Fog lights do not replace headlights.
• Daytime running lights and parking lights — to make the vehicle visible during the day and at dusk. An LED bulb alone doesn’t add a DRL function—it depends on the headlight design and the car’s wiring.
• Turn signals, brake lights, reverse lights, interior lights, and license plate lights — separate small bases (W5W/T10, C5W, P21W, PY21W, T20); the type is listed in the manual or on the old bulb.

Additional lamps and accessories

• Auxiliary lamps with a metal housing, with a plastic housing, and without a housing — for SUVs, pickups, special equipment, and work-area lighting.
• CANbus adapters (often called “error cancellers”) — eliminate the “bulb failure” warning and flickering after installing LED bulbs.
• Adapters for LED bulbs — mounting retainers that help an LED bulb seat tightly in the OEM headlight socket. This is a different part from a CANbus adapter: one holds the bulb, the other works with the electronics. H7 adapters are vehicle-specific—made for a particular car and separately for low and high beam—so choose them by your make and model.

What to consider before buying

• Replace bulbs in pairs—otherwise the left and right headlights will differ in brightness and color.
• Do not install a halogen bulb with higher wattage than OEM: excess power overheats the reflector and wiring.
• Do not touch the glass of a halogen bulb with your fingers—skin oils cause overheating and shorten lifespan.
• Compare luminous flux in lumens, not only wattage: LED can produce the same or higher output with less consumption.
• A color temperature of 4300–6000 K provides the best contrast for the road and signs; colder light looks striking but performs worse in rain and fog.
• For LED, check cooling (heatsink or fan) and rear length—the bulb must fit under the factory headlight cap. Dust and moisture protection should be at least IP65.
• After replacing headlight bulbs, check headlight aim: it’s easiest to park in front of a wall and see where the cutoff line falls.

This description was prepared with the help of AI based on the analysis of over 1 million phone calls between DD Tuning managers and customers, and the company knowledge base. We collected the questions customers ask most often and the answers verified in practice.