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Complete LED Conversion Kits & Bulbs for Exterior and Interior Vehicle Lighting

Underground Lighting collection brings together LED conversion kits and LED replacement bulbs engineered for headlights, fog lights, turn signals, brake lights, reverse lights, DRLs, and interior lighting. All products use LED (Light Emitting Diode) solid-state technology, where light is produced through electroluminescence at a p-n junction, eliminating filaments and gas found in halogen and HID systems.

The collection uses automotive-grade LED diode types, including SMD (Surface-Mount Device), and high-power Cree/Philips-class chips, selected based on application.
Headlights for chip focal accuracy to match OEM halogen filament position and control glare, Fog lights for wide beam dispersion and lower mounting efficiency for reduced backscatter and signaling lights focus on instant response time and high on/off contrast for safety compliance.

Typical performance values across the category range from 6,000 to 12,000 lumens per pair with 40–60W system draw, delivering 3–5× the usable brightness of halogen bulbs while maintaining lower electrical load.

Compatibility, CANbus & Electrical Integration

Modern vehicles (especially 2007+ models) use CANbus bulb monitoring systems that detect resistance changes. This collection includes CANbus-compatible LED bulbs, , anti-flicker resistor decoders, and plug-and-play load resistors to:

  • Prevent dashboard error warnings
  • Eliminate flickering or pulsing
  • Maintain OEM electrical behavior

All products operate on 12V DC automotive systems and are designed for plug-and-play installation, requiring no cutting or permanent wiring modifications.

What this collection includes

  • LED Headlight Kits & Bulbs
    H1, H3, H4, H7, H9, H11, H13, 9004, 9005 (HB3), 9006 (HB4), 9007, 9012, 880/881, H15
    Single-beam and dual-beam formats for low beam, high beam, DRL, and combined hi/low systems. These replace halogen headlights directly and are optimised for reflector and projector housings with adjustable or fixed chip orientation.

  • LED Fog Light Bulbs & Kits
    H1, H3, H8, H10, H11, 9006, 5202, 9140, 9145, PY13W, PSX26W, 880/881 .
    Designed for low-mounted bumper applications, fog light products use white (≈6000K) and yellow (≈3000K–4300K) color temperatures. Yellow wavelengths improve penetration in fog, rain, and snow, while white enhances contrast in light mist

  • LED Signaling & Safety Lights
    Turn signals, brake lights, tail lights, reverse lights, switchbacks, and CANbus sets

  • Interior & Auxiliary LED Lighting
    RGB interior kits, dome lighting, accent lighting, and auxiliary illumination

High-output LEDs generate heat at the base rather than the glass. To manage this, products in this collection integrate aluminum heat sinks, active cooling fans, or hybrid thermal paths, reducing the risk of housing damage or lumen drop-off when installed in confined headlight or fog light enclosures.

Beam pattern accuracy, mounting position, and application-specific brightness are emphasised to support DOT/SAE-compliant use when installed correctly. The collection avoids over-brightness in fog and signal applications, where excessive lumen output can reduce visibility or cause glare, aligning performance with real-world driving conditions rather than raw lumen claims.


For more information, feel free to contact us, our experts at Underground Lighting are here to serve you!

Why Choose Underground Lighting LED Conversion Kits & Bulbs

  • 3–5× Higher Brightness With Controlled Output

    LED bulbs deliver 6,000–12,000 lumens per pair, significantly higher than halogen, while maintaining focused beam geometry for headlights and wide, low patterns for fog lights.

  • 25,000–50,000+ Hour Operating Lifespan

    Solid-state LED construction lasts 25–100× longer than halogen (400–1,000 hours), reducing replacement frequency and long-term maintenance.

  • Instant Full Brightness With Zero Warm-Up

    LEDs reach 100% output immediately, outperforming HID systems that require warm-up, improving safety for braking, signalling, and sudden night driving.

  • Lower Power Draw With Higher Energy Efficiency

    Operating at 40–60W per pair, LEDs convert more electrical energy into usable light, reducing load on the battery and alternator.

  • Shock- and Vibration-Resistant for Trucks & SUVs

    With no fragile filament, LED bulbs withstand vibration and rough road conditions, making them suitable for trucks, off-road vehicles, and daily drivers.

  • Error-Free Operation in Modern Vehicles

    CANbus-compatible LEDs and anti-flicker modules prevent dashboard errors, flickering, and hyperflash, ensuring stable performance in vehicles with ECU monitoring.

How to Choose the Right LED Lights for Your Car

Choosing the right LED light bulbs for cars can be easy when you follow a few simple steps:

  1. Identify the bulb type you need: You can find this in your owner’s manual under the "light specifications" section or by removing the existing bulb and checking the part number. Common types include 3157, 7443, and 1157 for exterior lights or festoon and wedge bases for interior bulbs.
  2. Use our Vehicle Search Tool: Match the exact bulb sizes for your make, model, and year to guarantee compatibility and eliminate guesswork.
  3. Decide on the features that matter most to you: Brightness level, color temperature, or CANbus compatibility for modern vehicles with error-checking systems. Our team is always available to help you compare options and find the best match.
  4. Place your order with confidence: We offer fast, reliable shipping across the U.S. and internationally, and every purchase is backed by our fitment guarantee, so you get the right LED car lights the first time.

Need help picking the right LEDs for your ride? Reach out to our lighting pros anytime - we’re here to make upgrading your car lighting easy.

Use Our Vehicle Finder to Shop Car LED Lights

Vehicle Part Search

Frequently Asked Questions: Car LED Lights

Can I install LED lights in my car myself?

Most LED bulbs are plug-and-play, designed to fit your factory housings with no extra tools or modifications. Just remove the old one, insert the new LED, and test it. If you experience flickering or dashboard errors, you might need a load resistor or decoder.

What’s the difference between a halogen bulb and LED bulb?

Halogen bulbs generate light using heat, which is less efficient and causes them to burn out faster. LED bulbs produce light electronically, resulting in lower power consumption, brighter output, cooler operation, and significantly longer lifespan.

Do LED bulbs work for all parts of the car?

At Underground Lighting, we have automotive lighting that works across all applications - headlights, taillights, brake lights, fog lights, license plate lights, dome and map lights, trunk lights, and more. Just make sure to get the correct bulb size and type for each area.

Will LED bulbs fit my car?

Our automotive LED lights are compatible with a wide range of vehicles, and you can use our Vehicle Finder to quickly check what fits your specific make and model. If you’re unsure, our lighting experts are here to help.

Why do some LED bulbs need resistors or decoders?

Some vehicles, especially newer ones, have advanced systems that monitor bulb performance. When switching to LEDs, the lower power draw can trigger “bulb out” warnings or cause hyper-flashing. Load resistors or CAN bus decoders fix these issues for smooth operation.

Can LED lights drain my car battery?

LED lights are actually more energy-efficient than traditional halogen bulbs, so they draw significantly less power from your vehicle’s electrical system. That said, like any electrical accessory, if LEDs are left on for an extended period while the engine is off, especially interior or accent lights, they can slowly drain the battery over time. To avoid this, make sure all lights are turned off when the vehicle is not running. For most drivers, LED bulbs are a smart upgrade that helps conserve battery power, not drain it.

Can I mix LED bulbs with a light kit in my car?

Yes. You can pair individual LED bulbs with a light kit as long as everything matches your vehicle’s power and connection type. Most drivers do this when they want stronger brightness in one area and a fuller lighting upgrade in another.

Will LED bulbs work properly in reflector headlights?

Yes. LED bulbs can work in reflector headlights, but results vary by design. Some reflector units spread the light evenly, while others create glare or uneven patterns. Choosing LED bulbs made specifically for reflector headlights gives you a much cleaner beam pattern and keeps oncoming drivers comfortable.

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