H4/9003 Headlight Bulb: All You Should Know

When it comes to personalising a car, lights are often a detail that cannot be ignored. In this fast-paced era, the H4/9003 headlight bulb is the most popular and versatile choice. Known for its dual filament design, it has both high and low beam capabilities, making it ideal for a variety of vehicles. In this comprehensive guide, we'll explore the features, specifications, and benefits of the 9003 headlight bulb. We'll also answer frequently asked questions, provide a step-by-step installation guide, and recommend the best 9003 LED bulbs on the market. Read on to find out more. 

What Is a 9003 Light Bulb?

The 9003 light bulb, also known as the H4 9003 bulb, is a versatile headlight bulb commonly used in many vehicles. It provides both high and low beam functions from a single bulb, making it a popular choice for car and motorcycle headlights. This dual-filament bulb is designed to offer improved visibility and safety on the road. 

9003 Specifications

  • Bulb Size: 9007/HB5
  • Light Power: ‎100W (55W/bulb)
  • Color Temperature: Bright White 6500K
  • Luminous Flux: 18000LM/set (9000LM/bulb)
  • Lifespan: Over 50,000 hours
  • LED Quantity: 2 bulbs (1 Pair)
  • Heat Dissipation Mode: Fan Dissipation
  • Certification: IP67 Water and Dust Seal, CE, RoHS
9003 LED Headlight Bulbs

Check out these high-performance 9003 LED bulbs for enhanced visibility and safety.

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9003 Features

  • See the Road Like Never Before: X2 H4 LED light bulbs adopt 7035 highly bright Top-Automotive LED chips which provide a total of 100W, 18000 lumens light output per set.
  • Long-Lasting Performance: Our effective heat dissipation system, including an intelligent temperature control chip and 20,000RPM silent turbofan, ensures that our X2 H4/9003 LED light bulbs work in all kinds of conditions for up to 10 years.
  • Quick and Easy Installation: Our 1:1 mini-size design ratio perfectly fits the original factory assembly, making installation a breeze. No tools are required, and it's plug-and-play, usually in 5 minutes or less.
  • Natural Daylight White: For driving safety, our 6500K natural white color is the ideal color for your car, providing a brighter and clearer view of the road without causing visual fatigue in night driving.
  • Universal Compatibility: Our built-in intelligent CSP LED chips are compatible with 99% of vehicles' systems. For certain vehicles, an additional CANBus decoder may be required.


Q1: Is 9003 bulb the same as H4?

A: Yes, the 9003 bulb is also known as the H4 bulb. They are interchangeable and provide the same functionality.

Q2: What do 9003 bulbs fit?

A: 9003 bulbs fit a wide range of vehicles, including many car and motorcycle models. They are commonly used for both high and low beam headlights.

Q3: Is H11 the same as 9003?

A: No, the H11 and 9003 bulbs are different. H11 is a single beam bulb typically used for fog lights or low beams, while 9003 (H4) is a dual-beam bulb used for both high and low beams.

Q4: Which is brighter H4 or H7?

A: H4 and H7 bulbs can vary in brightness depending on the specific model and manufacturer. Generally, H4 bulbs provide both high and low beams, while H7 bulbs are single beam and may be used for either high or low beam, depending on the vehicle.

How to Install 9003 Headlight Bulb

Installing a 9003 headlight bulb is a straightforward process. Here is a step-by-step guide:

  1. Remove the original bulb and original rubber cover.
  2. Insert the bulb lamp as the direction of the arrow.
  3. Lock the bulb lamp by rotating 45 degrees clockwise.
  4. Connect the power line with original car lamp connector

Want to improve driving safety and night vision? Try Flashark 9003 headlightsWe bring you a revolutionary lighting solution to make your driving experience brighter and safer.

X3S 9003 LED Headlight Bulbs

Our Advantage:

  • 50,000+ Hours Lifespan
  • 2 Year Hassle-free Warranty
  • 10 Minutes Easy Installation
  • 99% of Vehicles are Compatible
  • No Dark Spots, No Shadows
  • Perfect Beam Pattern, No Glare
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