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D4S Xenon HID Headlight Bulbs

Underground Lighting D4S Xenon HID bulbs provide a direct-fit replacement for compatible OEM projector systems, with 35W performance, mercury-free construction, and multiple Kelvin options for replacement or upgraded appearance.
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With a 4.95 average rating across Google and Judge.me, Underground Lighting has earned the trust of drivers looking for dependable LED lighting upgrades. See why customers choose us for fitment support, quality products, fast shipping, and brighter lighting solutions for cars, trucks, and SUVs.

D4S Xenon HID Headlight Bulbs for OEM Projector Lighting Systems

This Underground Lighting collection is focused exclusively on the D4S bulb, a mercury-free Xenon HID headlight bulb engineered for OEM projector-based headlamp systems. The D4S Xenon HID bulb is a high-intensity discharge light source that produces illumination through an electric arc inside a xenon-filled arc chamber rather than a filament or LED emitter.

D4S bulbs use a specific P32d-5 indexed base and 35W operating specification, which differentiates them from other HID bulb types such as D2S and D1S. Although these bulbs may look similar, they are not interchangeable because their electrical and ignition configurations differ. Using the wrong bulb or ballast can prevent proper ignition or damage components.

What sets D4S apart from older HID bulbs is that it runs mercury-free. That's the whole reason the D4 series exists. It keeps the bulb RoHS-compliant and certified under ECE R99, which matters because a lot of newer vehicles and markets, especially in EU-regulated regions, simply won't accept anything else. That's why you'll find D4S in factory HID systems from Toyota, Lexus, Subaru, Honda, and Infiniti. These automakers need bulbs that clear environmental rules without giving up the optical precision a projector setup depends on.

D4S Bulb Options

  • D4S Xenon HID Headlight Bulbs (35W) in 6000K white and 8000K white with blue tint
  • D4S 5000K Extreme White Xenon HID Bulbs, designed for a brighter-looking white appearance while maintaining projector-focused beam performance

Typical light output for OEM-spec D4S bulbs ranges from ~3200 to 3500 lumens per bulb, comparable to D2S and D3S formats when installed in matched projector optics. 4300K remains the OEM standard for maximum usable road illumination, while 5000K–6000K offers a cleaner white appearance. Higher Kelvin options such as 8000K shift beam color toward blue, reducing effective lumen output in favor of style.

D4S bulbs only belong in projector housings, not reflector housings. The projector's cutoff shield and lens are what shape the beam and keep the light where it should be instead of scattering it into oncoming traffic. You'll usually see D4S running as the low beam, and in bi-xenon setups, a small mechanical shutter drops out of the way so the same bulb can throw a high beam too. Installation is where people get tripped up. Seat the twist-lock properly, confirm your ballast actually matches the bulb, and check fitment against your exact year and model before you buy. Get any of those wrong, and the beam pattern goes off, which hurts your visibility and can put you on the wrong side of local headlight laws.

This category supports OEM replacement and aesthetic upgrade paths through Underground Lighting, offering spec-matched D4S bulbs designed to maintain electrical stability, optical performance, and regulatory compliance.

Take a moment to discover our complete HID conversion kits, Replacement bulbs & accessories & wide variety of LEDs - fog lights, turn signal lights, and switchback turn signal lights - and use the bulb finder to ensure the right match for your vehicle.

Why Choose Underground Lighting D4S Xenon HID Headlight Bulbs?

  • OEM-Level Brightness With ~3200–3500 Lumens

    Underground Lighting D4S bulbs are designed around the standard 35W D4S HID format used in compatible factory projector systems. An OEM-spec D4S lamp is rated at approximately 3200 lumens, providing strong xenon illumination with the focused output expected from a properly matched projector headlight.

  • Mercury-Free, Eco-Compliant HID Technology

    The D4S format uses mercury-free xenon HID technology, distinguishing it from earlier D1 and D2 generations. Underground Lighting D4S replacements follow this later-generation bulb format for compatible vehicles originally designed around D4S lighting systems.

  • Stable 42V / 35W Electrical Performance

    Underground Lighting D4S bulbs follow the standard 42V, 35W operating format required by compatible D4S systems. Matching the bulb with the correct D4S ballast helps maintain stable ignition, consistent light output, and proper electrical operation.

  • Precision Beam Cutoff in Projector Housings

    D4S is an S-type xenon bulb designed for projector optics. Underground Lighting D4S replacements use the correct indexed base and arc positioning to support the intended focal point, cutoff, and controlled light distribution when installed in a compatible projector housing.

  • Multiple Kelvin Options for Function or Appearance

    Underground Lighting offers 5000K, 6000K, and 8000K D4S options. 5000K provides a cleaner neutral-white appearance, 6000K produces a cooler white beam, and 8000K adds a stronger blue-white tint, with higher Kelvin choices generally prioritizing appearance over maximum usable light output.

  • Direct OEM Replacement With No Wiring Modifications

    Underground Lighting D4S bulbs are designed as replacement options for vehicles already equipped with compatible factory D4S HID systems. When paired with the correct 42V D4S ballast, they retain the original bulb format without requiring conversion to another HID type or unnecessary wiring changes.

How to Choose the Right D4S HID Headlight Bulb

Confirm that your vehicle uses a D4S HID system, then match the bulb to the ballast, housing, and preferred color temperature.

  • Check fitment: Verify D4S using the original bulb or owner’s manual.
  • Match the ballast: Use a bulb compatible with the vehicle’s D4S HID system.
  • Choose the color: 5000K for neutral white, 6000K for cooler white, and 8000K for a bluer appearance.
  • Check the housing: D4S bulbs are designed for compatible projector headlights.

Watch these helpful Underground Lighting videos for step-by-step guidance, product details, and real-world installation tips.

Find the Right D4S HID Headlight Bulbs for Your Vehicle

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D4S HID Headlight Bulbs FAQs

A D4S is a 35W xenon HID bulb designed for projector-style headlight systems. An OEM-spec D4S typically operates at around 42V, uses a P32d-5 base, and produces approximately 3,200 lumens.

D4S HID bulb prices vary by color temperature, output, construction, and product type. The D4S bulb pairs listed in the Underground Lighting collection currently range from $64.99 to $150.00, depending on the selected model. Prices, discounts, and availability may change over time.

D4S bulbs are designed for projector headlights, while D4R bulbs are designed for reflector-based xenon systems. The two formats use different bases and optical designs, so they should not be treated as interchangeable. OSRAM lists D4S at 3200 lumens and D4R at 2800 lumens for its OEM-spec lamps.

No. D4S and D2S bulbs use different electrical systems. A standard D4S bulb operates at 42V, while D2S operates at 85V. They also use different system configurations, so the correct bulb and ballast must match the vehicle’s original HID setup.

No. D4S and D3S both operate at 35W and 42V, but their base and ignition arrangements differ. D4S uses a P32d-5 base, while D3S uses a PK32d-5 base, so they are not direct substitutes.

D4S xenon bulbs need a compatible HID ballast to start the arc and control the lamp during operation. The ballast must support the 35W, 42V D4S system and should not be confused with the 85V systems used by D1S and D2S bulbs.

Color temperature mainly affects the appearance of the light rather than determining brightness. 5000K gives a cleaner neutral-white appearance, 6000K produces a cooler white beam, and 8000K creates a stronger blue-white tint. Underground Lighting currently offers D4S options across this 5000K–8000K range.

Lifespan varies by bulb quality and operating conditions. As an OEM reference, OSRAM rates its standard D4S XENARC ORIGINAL bulb at about 2,000 hours B3 and 4,000 hours Tc. These figures are manufacturer-specific and should not be treated as a guaranteed lifespan for every D4S bulb.

D4S bulbs are designed for projector-based headlight systems, not D4R-style reflector systems. Using the correct bulb for the housing is important because the headlight optics determine beam shape, cutoff, and glare control.

Check the existing bulb's assigned number, review the owner’s manual, or use a reliable vehicle fitment tool. Confirm the D4S bulb type, projector housing, ballast compatibility, and electrical system before ordering, because similar-looking xenon bulbs are not necessarily interchangeable.

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