H4 LED Bulbs: Low and High Beam in One Bulb
Quick answer: H4 (also called 9003 or HB2) is a dual-filament bulb: one bulb gives both the low beam and the high beam. LightsUp sells three H4 LED options: App Control, CORE150 (150W) and a compact 1:1 bulb.
About the H4 bulb
Also called: 9003, HB2
Base: P43t
Halogen power: 60/55W
Filaments: two – low beam and high beam in one bulb
Typical use: headlights with a single bulb per side
LightsUp H4 LED bulbs
Magic App Control LED bulbs – change colour temperature and brightness and switch on a strobe effect from your phone over Bluetooth. Built-in CAN bus, up to 4× brighter than halogen.
Best for: drivers who want a modern look and full control from the phone.
CORE150 LED bulbs (150W) – 75W per bulb, 150W per set. Bright white light and an external driver box for better cooling. Plug & play, CAN bus ready, no app needed.
Best for: maximum brightness when there is room behind the headlight for the driver box.
Compact 1:1 H4 LED bulbs (6000LM) – 6000LM per set, 6000K cool white, no external driver box. Fits like the original halogen bulb.
Best for: tight headlight housings and small dust covers.
Which H4 LED bulb should I choose?
Want the brightest light? Choose CORE150, if there is room behind your headlight for the driver box.
Short on space behind the headlight? Choose the Compact 1:1 H4 – it has no driver box and fits like the halogen bulb.
Want to change colour and brightness from your phone? Choose App Control.
Cars that use H4
These are some of the cars covered by our bulb size guides that use H4. Tap a car to see all of its bulb sizes.
Suzuki Swift (Mk2 & Mk3) (2004–2017) – low beam, high beam
Toyota Tacoma (2nd gen) (2005–2015) – low beam, high beam
FAQ
Do H4 LED bulbs work for both low and high beam?
Yes. Like the halogen H4, our H4 LED bulbs switch between low beam and high beam in one bulb.
Is 9003 the same as H4?
Yes. 9003 and HB2 are other names for the same H4 bulb, so H4 LED bulbs fit cars that list 9003.
Will H4 LED bulbs cause a dashboard error?
App Control and CORE150 are CAN bus ready, which is designed to prevent flicker and bulb-out warnings on newer cars.
Are the bulbs sold as a pair?
Yes, every set contains two bulbs – one for each side.
Check before you order
Check the code printed on the base of your current bulb or in your owner's manual before ordering. Not sure? Send us a photo of your bulb to info@lightsup.pro and we will confirm the right size for you.
Not sure which size your car uses? Try our Bulb Finder – pick your make, model and year and see the right bulbs in seconds.
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