Collection: Original Xenon Bulbs (D1S, D2S, D3S...)

What is a Xenon bulb?

A xenon bulb (or HID, for High Intensity Discharge) is a gas-discharge bulb that produces light through an electric arc between two electrodes immersed in a mixture of xenon gas and metallic salts. Unlike conventional halogen bulbs, there is no filament.

Xenon requires an electronic ballast (high voltage transformer) to start the electric arc. Depending on the model, the ballast can be integrated into the bulb or mounted separately in the headlight assembly.

The 4 standard original models

There are four European-standard original xenon bulb types. Important: only these bulbs are approved for road use.

D1S

• Integrated ballast (igniter in the base)
• Contains mercury
• Voltage: 85V
• Power: 35W
• Common on Audi, BMW, Mercedes (recent generations)

D2S

• External ballast (separate in the headlight)
• Contains mercury
• Voltage: 85V
• Power: 35W
• The most common xenon standard — first generations equipped

D3S

• Integrated ballast
• Mercury-free (Euro 6 standard, more ecological)
• Voltage: 42V
• Power: 35W
• Modern replacement for D1S

D4S

• External ballast
• Mercury-free
• Voltage: 42V
• Power: 35W
• Modern replacement for D2S — equips Toyota, Lexus

Variants with integrated reflector: D2R and D4R models include a silver coating that acts as a reflector — used in some dual-function projector headlights.

Advantages of xenon bulbs

• More brightness: 3,000 lumens (xenon) vs 1,500 lumens (halogen H7) — i.e., 2× more light on the road.
• Wider and longer beam: illuminates up to 100 m in front of the vehicle.
• Light close to daylight: 4,200–6,000 K (white/blue-white), reduces eye fatigue.
• 3× longer lifespan: 2,500 to 3,000 hours vs 800–1,000 hours for a halogen.
• Reduced consumption: 35W vs 55W for a standard H7.

How to tell if my vehicle is equipped with xenon?

Several clues to recognize a car with original xenon:

1. Light color: xenon gives a characteristic blue-white light, while halogen is yellow-white.
2. Progressive start-up: when switched on, the light gradually increases in intensity over 2–3 seconds (the time it takes for the arc to stabilize). A halogen reaches its full power instantly.
3. Headlight unit: presence of a headlight washer (water jets) and an automatic leveling system — these pieces of equipment are mandatory with xenon.
4. Vehicle manual: indicates the type of headlight ("xenon headlights" or "discharge headlights").

How to change a xenon bulb?

⚠️ Safety: high voltage — A xenon bulb requires a starting voltage of over 20,000 V. Be sure to turn off the ignition and disconnect the vehicle from all power sources before working.

1. Turn off the ignition and wait at least 5 minutes for the capacitors to discharge.
2. Open the hood and locate the rear of the headlight assembly.
3. Remove the protective cover.
4. Disconnect the power connector from the bulb (or ballast for D2S/D4S).
5. Unclip the retaining clip and remove the bulb.
6. Insert the new bulb without touching the glass (use a cloth or gloves).
7. Reclip the clip and reconnect the connector.
8. Close the cover, start the vehicle and check for proper operation.

On some recent vehicles (BMW, Mercedes), replacement requires an OBD diagnostic tool to reset the lighting management system.

How to tell if a xenon bulb is dead?

Several symptoms indicate a xenon bulb nearing the end of its life:

• Intermittent light or irregular flickering when starting.
• Color turning pink, purple, or reddish — a sign of metallic salt wear.
• Increasingly long start-up time (more than 5 seconds to reach full intensity).
• Complete extinction and no longer able to re-ignite.

If only one bulb is dead but the other is still working, it is highly recommended to replace both at the same time to maintain consistent brightness (bulbs age in parallel).

Color temperature (Kelvin)

The color temperature of a xenon bulb is expressed in Kelvin (K). Original bulbs are around 4,200 K (neutral white, daylight).

• 4,200 K — Original standard, neutral white light, best real visibility.
• 5,000–6,000 K — Colder white, slightly bluish.
• 6,500 K and beyond — Blue/violet, "tuning" effect but reduced visibility (and often not approved).

Advice: for driving, stick to 4,200–5,000 K. Beyond 6,000 K, you lose real visibility (blue light is less well perceived by the eye and diffuses more in rain/fog) and risk a fine.

Regulations

The use of xenon bulbs is strictly regulated:

• Standard R98 / R99: only bulbs certified by this European standard are approved for road use.
• Mandatory headlight washers: any vehicle equipped with xenon must have a headlight cleaning system (water jets).
• Automatic leveling system: mandatory to avoid dazzling other road users.
• Halogen → xenon conversion kits prohibited: installing a xenon kit on a vehicle designed for halogen is illegal (fine of €135 + withdrawal of registration certificate, mandatory re-inspection).

FAQ — Xenon bulbs

Which xenon bulb should I choose for my car?

The standard is defined by your vehicle (D1S, D2S, D3S, or D4S). You cannot choose another model — each type has a different base and specific ballast compatibility. Check the reference on the existing bulb or in your manual.

What is the lifespan of a xenon bulb?

Between 2,500 and 3,000 hours on average, or about 8 to 10 years with normal use. This is about 3 times more than a standard halogen bulb (800–1,000 hours).

How to install xenon headlights on a halogen car?

This conversion is illegal on public roads in France (and throughout the EU) without also modifying: the headlight washer system, the automatic leveling system, the headlight optics, and passing a technical inspection with validation. In practice, it is almost impossible to get it approved. Stick with your original lighting or switch to LED if compatible.

Can a xenon bulb be replaced by an LED?

No, unless a model is specifically approved by the manufacturer. LEDs and xenon have different headlight optics (reflector vs projector); an LED in a headlight designed for xenon will produce a disoriented beam that dazzles other drivers.

Xenon bulbs are more expensive, is it profitable?

Yes, in the long run: a xenon bulb costs €30–80 compared to €5–15 for a halogen, but lasts 3× longer and consumes 30% less. Over 8 years, the total cost is comparable, and the lighting quality is significantly superior.

What is the difference between D1S and D2S?

The D1S has its ballast (igniter) integrated into the bulb base, while the D2S uses a separate ballast in the headlight. The two bulbs are not interchangeable.

Are Norauto, Philips, or Osram xenon bulbs equivalent?

Yes, the main brands (Philips Xtreme Vision, Osram Xenarc Cool Blue, GE, Bosma) all comply with the R98/R99 standard. Differences lie in longevity and color temperature. Prefer original equipment manufacturer (OEM) references for better compatibility with the vehicle's management system.

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