H4 Car Headlight Bulbs
Halfords range of H4 bulbs
Our varied range of H4 bulbs offers a great ëtwo-in-oneí functionality for many different vehicle models. Experience a brighter output as you stay safe and seen while driving on the roads. All of our H4 bulbs are ECE type-approved for road legality and safety.
An H4 bulb is a dual-filament halogen bulb, which makes it ideal for performance as both a low (dipped) beam as well as a high (main) beam headlight. This means that one unit provides two ways of working for ultimate convenience and easy installation or replacement. Choosing an H4 headlight bulb is a popular choice as they are still widely used among older cars that have one-bulb systems.
Selecting the right H4 replacement bulb can be tricky, which is why weíve compiled a car bulb buyer's guide to make the process as easy as possible for our customers. We also offer a bulb-finder tool on our website where you can enter your registration number and unlock the best options for your vehicle. To ensure that you pick the correct H4 bulb for your car, you should consult your ownerís manual for the exact required bulb type. Also, be sure to consider the brightness of your H4 replacement bulbs ñ a standard H4 bulb offers 1,000 lumens (most often using 55W) for a low beam and 1,650 lumens (using 60W) for its high beam. In addition, H4 bulbs use a P43t base with 3 connectors, meaning that it is essential to ensure a proper fit and lock-in when installing. For more information on bulb compatibility, check out our detailed list of car bulb types.
Level up your headlight performance by upgrading to H4 bulbs and enhance your vehicleís performance, safety, and even visual appearance. Experience brighter illumination with high-performance halogen H4 variants as they emit more light while offering better energy efficiency. A premium H4 bulb allows the driver to enjoy a longer-lasting, robust performance for less maintenance.
Before you begin installing your H4 replacement bulbs, double-check your vehicleís bulb type for compatibility and legality. Clean the area prior to the replacement to prevent fogging, always being careful not to directly touch the glass due to hot temperatures. After you have installed your H4 bulb, check that the light turns on before you drive. Alternatively, for added peace of mind that youíre road legal, take advantage of our bulb fitting service at your local Halfords store, where our experts will install and align your H4 replacement bulb for you.
What's the difference between h4 and h7 bulbs?
H4 and H7 bulbs are not interchangeable as they have different designs and functions:
H4 bulbs have dual filaments, providing both high and low beams in a single bulb.
H7 bulbs have a single filament, meaning separate bulbs are needed for high and low beams.
Visit your nearest Halfords store for expert advice and fitting services!
How many amps does a h4 bulb draw?
An H4 headlight bulb is a dual-filament bulb, meaning it operates at two different wattages—typically 60W for high beam and 55W for low beam. At a standard 12V power supply, the current draw is:
High beam (60W): ~5 amps
Low beam (55W): ~4.6 amps
Higher wattage H4 bulbs, such as 100/90W variants, will draw more power and may require upgraded wiring to prevent overheating or voltage drops.
What car does a h4 bulb fit?
H4 bulbs are commonly used in cars, motorcycles, and some trucks that require a dual-filament headlight bulb, meaning they provide both high and low beams in a single unit. They are widely found in older vehicles, classic cars, and certain modern models that still use this design.
To check if an H4 bulb fits your vehicle, use the Halfords Car Bulb Buyer's Guide or visit your nearest Halfords store, where our experts can help you find the right fit and even install it for you.
What is the difference between h1 and h4 bulbs?
H1 and H4 bulbs serve different purposes and are not interchangeable. Here’s how they differ:
H1 Bulbs: Single-filament bulbs used for either high beams, low beams, or fog lights, depending on the vehicle's setup.
H4 Bulbs: Dual-filament bulbs that provide both high and low beams in one bulb, commonly used in older and some modern vehicles.