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H4 / 9003 LED & HID Headlight Bulbs

Built for dual-beam headlight systems where a single H4 / 9003 bulb handles both low and high beam functions, this collection includes LED upgrades, HID replacement bulbs, and a 35W Hi-Low CANbus HID kit. Each option is designed around a different lighting setup, so matching the bulb type, beam operation, housing, and vehicle electrical system is important before choosing an upgrade.

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H4 / 9003 Headlight Bulbs for Dual-Beam High & Low Beam Systems

The H4 headlight bulb, also marketed as 9003 in many regions, is a dual-beam automotive lighting standard that integrates high-beam and low-beam functions into a single bulb. Identified by its P43t (P43t-38) bayonet base and three electrical contacts, the H4 format enables instant filament-based beam switching without shutters or solenoids, simplifying headlamp assembly design.

H4 bulbs operate on a 12V passenger-vehicle electrical system and are widely used in cars, SUVs, and light trucks, particularly in compact and older headlamp housings where a single bulb performs both lighting roles.

Typical halogen H4 specifications include:

  • High beam: 60W
  • Low beam: 55W
  • Current draw: ~5.0A
  • Light output: ~1,000–1,700 lumens depending on beam mode
  • Color temperature: ~3,000–3,200K warm white

Because the H4 bulb does not contain a mechanical shutter, the headlight housing optics fully control the beam pattern and cutoff, whether reflector-based or designed for dual-filament-compatible projector systems. This makes filament or emitter positioning a critical factor for glare control and road legality when upgrading to LED or HID.

This Underground Lighting collection includes 3 H4 technology variants, covering LED retrofit, HID replacement, and CANbus HID conversion:

Explore our collection of fog lights and turn signal lights, including switchback styles, and use the bulb finder to match your vehicle.

1. H4 LED Headlight Kit – 60W 12000LM Plug & Play (PAIR)

This dual-beam H4 LED replacement kit replicates both high- and low-beam functionality using solid-state LED technology. Light is produced through electroluminescence at a semiconductor p-n junction, eliminating filaments and halogen gas.

  • Output: Up to 12,000 lumens per pair
  • Power draw: 60W system total
  • Color temperature: 6000K pure white
  • Design intent: Plug-and-play installation in H4 / 9003 housings

Proper LED chip placement relative to the original dual filaments is essential to maintain correct beam separation between low- and high-beam modes.

Explore our other forward lighting and headlight options.

2. H4 HID Replacement Bulbs – 3700 Lumens (PAIR)

These are xenon HID arc bulbs designed for vehicles already equipped with H4 HID systems. An electric arc inside a xenon-gas quartz capsule generates light, and an external 35W ballast is required for ignition and regulation.

  • Output: Approximately 3700 lumens per pair
  • Color temperatures: 3000K yellow, 6000K white, 8000K white/blue, 10000K blue
  • Use case: Direct H4 HID bulb replacement, not a full conversion

These bulbs support both visibility-focused and appearance-focused configurations depending on the selected color temperature.

3. H4 / 9003 35W Hi-Low CANbus HID Kit with Halogen High (PAIR)

This hybrid H4 HID conversion kit is engineered for dual-beam headlamp systems.

The low beam operates on xenon HID, while the high beam retains halogen filament operation, preserving OEM high-beam response and the characteristics of the original halogen high-beam function.

The kit includes:

Electrical specifications:

  • Ignition phase: Up to ~23,000V
  • Sustained operation: ~85V AC regulated output
  • Vehicle compatibility: 12V systems with bulb monitoring
  • Ballast power: 35W

CANbus integration is designed to help prevent dashboard errors, flicker, and bulb-out warnings common in compatible modern vehicles.

Browse our fog light and turn signal collections, including switchback designs, and confirm vehicle fitment via the vehicle search tool.

Compare between HID & LED options or contact Underground Lighting experts for more information; we’re just a click away.

Why Choose Underground Lighting of H4 LED & H4 HID Upgrades

  • Dual-Beam Operation in 1 Bulb

    Underground Lighting H4 upgrades retain high- and low-beam functions in a single bulb format, supporting the dual-beam operation required by compatible H4 / 9003 headlight systems.

  • Up to ~4× Higher Brightness Than Halogen

    Underground Lighting H4 options increase usable output beyond standard halogen, with ~3,700-lumen HID bulbs and LED kits rated up to 12,000 lumens per pair, depending on configuration.

  • Defined Color Temperature Options

    Underground Lighting H4 options include 3000K yellow, 6000K white, and 8000K–10000K blue-tinted outputs, letting drivers choose lighting based on visibility needs or preferred appearance.

  • CANbus Error Suppression in Modern Vehicles

    Selected Underground Lighting H4 CANbus HID kits include load simulation and voltage regulation designed to help reduce flicker, bulb-out warnings, and ECU-related lighting errors in compatible vehicles.

  • Efficient Power Utilization

    Underground Lighting H4 LED systems deliver high output at controlled wattage, while compatible HID systems use a regulated 35W ballast to provide stronger illumination than standard halogen lighting.

  • Broad Global Compatibility

    Underground Lighting H4 / 9003 upgrades support a widely used dual-beam bulb standard found across many OEM and aftermarket applications, making vehicle-specific replacement and fitment easier to verify.

How to Choose the Right H4 / 9003 Headlight Bulb

Getting the right H4 / 9003 bulb starts with confirming the correct fitment and selecting the lighting setup that matches your vehicle.

  • Confirm H4 / 9003 fitment: Check the owner’s manual, existing bulb, or Vehicle Search Tool.
  • Choosing between LED or HID: Use LED if you want to upgrade from the current dual-beam headlamp; use HID lamps to replace your current HID lamps or choose a full HID kit.
  • Check both beam functions: Make sure the bulb supports both low and high beams.
  • Choose the color: 3000K is yellow, 6000K is white, and 8000K–10000K gives a bluer look.
  • Check available space: Confirm there is enough room for LED cooling parts, HID wiring, or ballasts.
  • Check CAN bus compatibility: If your vehicle monitors bulb load, use a compatible CAN bus setup to help prevent warning messages or flickering.

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

Find the Right H4 / 9003 Headlight Bulb for Your Vehicle

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H4 / 9003 LED & HID FAQs

An H4 / 9003 bulb is a dual-beam headlight bulb that provides both low- and high-beam functions within one bulb location. A regular halogen H4 uses a P43t socket with three electrical terminals and operates at 60W for the high beam and 55W for the low beam in a 12V system.

H4 / 9003 lighting products generally range from about $39.99 for a pair of HID replacement bulbs to $199.99 for complete LED or CANbus HID kits. The final price depends on whether you need replacement bulbs or a complete system.

H4 and 9003 are often interchangeable for the same dual-beam automotive bulb format. Both are generally classified with the P43t-38 base and 60/55W halogen specification. Check your vehicle fitment first because different models have different headlights.

A standard H4 halogen bulb produces about 1,650 lumens on high beam and 1,000 lumens on low beam, with output varying by bulb specification and operating conditions.

When comparing H4 upgrades, actual lumen output, emitter positioning, and beam performance are more significant than advertised brightness multipliers.

Neither is better than the other when used in an H4 / 9003 headlight system. LED ensures instant light and allows keeping high and low beam in one system. HID is powerful but needs ballasts and other electronic devices.

Yes. H4 HID bulbs need an appropriate external ballast to ignite the xenon arc and regulate electrical operation.

HID replacement bulbs are intended for an existing compatible HID system. They cannot operate correctly as direct standalone replacements for factory halogen H4 bulbs without the required HID components.

The H4 / 9003 Hi-Low CANbus HID kit works by using HID Xenon bulbs in low beam and halogen bulb in high beam.

Some of the components of the system are the HID H4 bulbs, 35W ballast, igniters, and CANbus.

They can in vehicles that monitor headlight electrical load. LED and HID systems may draw current differently from the original halogen bulb, resulting in bulb-out warnings, flickering, or other electrical errors.

CANbus-compatible units are recommended in some cases but not always necessary.

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