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Thinking about upgrading your headlights or replacing your dim stock H4 bulb? Good news—it’s easier than you might think!
H4 headlight bulb is one of the most common types found in cars and motorcycles, known for its dual-filament design that powers both high and low beams.
Whether you’re switching to a brighter LED version or simply changing an old halogen, you can handle the installation yourself in just a few minutes.
In this guide, we’ll walk you through 5 simple steps to install an H4 headlight bulb safely and quickly—no special tools or experience required.
What is H4 Headlight Bulb?
H4 Halogen Bulb
An H4 headlight bulb is a popular type of automotive light known for its dual-filament design, meaning it can provide both high and low beams in a single bulb.
This makes it highly efficient and commonly used in motorcycles, older vehicles, and some modern cars.
If you’re wondering how it compares to other common types like the H7, which is a single-beam bulb, you can check out this helpful guide: H4 vs H7 Bulb: What’s the Difference? for a detailed comparison.
H4 HID Bulb
An H4 HID bulb is a high-intensity discharge headlight bulb designed for vehicles using the H4 socket. It typically offers brighter light output than halogen, with a single bulb providing both high and low beams through a mechanical shutter. It requires a ballast to operate.
If you’re comparing options, here’s a helpful guide on HID vs LED headlight bulb, which is better?
H4 LED Bulb
An H4 LED bulb is a modern headlight bulb that fits H4 sockets and uses LEDs to produce light. It provides both high and low beams in one bulb, offering brighter, more energy-efficient lighting than halogen. It’s plug-and-play in many vehicles and has a longer lifespan.
If you’re considering an upgrade, see how LED vs halogen headlight bulb, which is better to make an informed choice.
Preparations Before Installing H4 LED Bulb
1️⃣ Check Your Vehicle’s Bulb Type
Before starting the installation, make sure you know your vehicle’s bulb socket type. Not sure how to tell if it’s H4, H7, H11, or 9005? Check out our guide on: How to Identify Headlight Bulb Socket?
2️⃣ Clean the Area Around the Headlight
Wipe away dust or moisture near the headlight housing. A clean install helps the bulb sit properly and prevents fogging.
3️⃣ Gather Basic Tools
Usually, no special tools are needed, but keep a screwdriver and gloves ready. Gloves help avoid touching the LED chips or glass surfaces.
4️⃣ Disconnect the Car Battery (Optional for Safety)
It’s a good idea to disconnect the battery to prevent short circuits or accidental power while working on the headlights.
5 Steps To Install H4 LED Headlight Bulb
Before we dive into the step-by-step installation process of H4 LED headlight bulbs, many car owners often ask: “Can I even install an LED bulb in my halogen headlight housing?”
If you’re wondering the same thing, check out our detailed blog post that explains everything you need to know: Can I Install LED Bulb in Halogen Headlight?
Step 1:
Open dust cover and take out the h4 halogen bulb
Step 2:
Twist the socket from the LED bulb and insert it into the right slot
Step 3:
Insert H4 LED bulb into the retainer holder with correct position.
Step 4:
Rotate the bulb clockwise, making sure the chips are facing at the 3 and 9 o’clock positions — this is key to achieving a proper beam pattern. Learn more about what makes a perfect beam pattern of LED headlight bulb.
Step 5:
Connect the power plug. Now that you’ve successfully installed your H4 LED bulbs.
If your vehicle uses a h7 bulb type, you can also check out our guide on how to install H7 LED headlight bulb.
H4 LED Headlight Bulbs Recommendation
 | Mr. Eagle NAOEVO NG H4 LED Bulb | 90W 10800LM
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| Small But Powerful NAOEVO SMART H4 LED | 35W 3800LM
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 | 3-Color in One Bulb NAOEVO S4 PRO 3 Color | 30W 3600LM
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