H4

H4 bulbs have been used in a large number of cars, including larger popular vehicles such as by Honda CR-V and HR-V models and Suzuki Grand Vitara among others.

Unlike the single filament H1, the H4 car bulb is dual filament, and is able to offer both main and dipped beam within a single bulb.

You can find a wide range of choices of H4 bulbs below, check Amazon for pricing and more details.

Buy H4 Headlight Bulbs

Philips 12342XV+S2 H4 X-Treme Vision +130%, Headlight Car Bulbs, Twin-Pack, White

Philips 12342XV+S2 H4 X-Treme Vision +130%, Headlight Car Bulbs, Twin-Pack, White

Simply S472 H4 Headlight Car Headlight Bulb, 12 V, 60V, 60/ 55W, Comply left ECE R-37, Base PK22n, Suitable for y 1 Headlights, Maximum Visibility

Simply S472 H4 Headlight Car Headlight Bulb, 12 V, 60V, 60/ 55W, Comply left ECE R-37, Base PK22n, Suitable for y 1 Headlights, Maximum Visibility

Philips RacingVision +150% H4 Headlight Bulb 12342RVS2, Twin Pack

Philips RacingVision +150% H4 Headlight Bulb 12342RVS2, Twin Pack

OPL5 H4/9003 LED Headlight Bulbs, 2020 Upgraded Version 3 Sides 360-degree COB LED Headlamp Bulbs -10000LM 70W 6000K Xenon White Extremely Bright Conversion Kit (2 PCS)

OPL5 H4/9003 LED Headlight Bulbs, 2020 Upgraded Version 3 Sides 360-degree COB LED Headlamp Bulbs -10000LM 70W 6000K Xenon White Extremely Bright Conversion Kit (2 PCS)

OSRAM NIGHT BREAKER LASER H4, next generation, +150% more brightness, halogen headlamp, 64193NL-HCB, 12V, passenger car, duo box (2 lamps)

OSRAM NIGHT BREAKER LASER H4, next generation, +150% more brightness, halogen headlamp, 64193NL-HCB, 12V, passenger car, duo box (2 lamps)

OSRAM COOL BLUE INTENSE H4, headlight bulb for halogen headlamps, xenon effect for white light, 64193CBI-HCB, 12V passenger car, duobox (2 units)

OSRAM COOL BLUE INTENSE H4, headlight bulb for halogen headlamps, xenon effect for white light, 64193CBI-HCB, 12V passenger car, duobox (2 units)

Philips 12342WVUSM WhiteVision Ultra Xenon Effect H4 Headlight Bulb, 4.200K, Twin Pack, Set of 2

Philips 12342WVUSM WhiteVision Ultra Xenon Effect H4 Headlight Bulb, 4.200K, Twin Pack, Set of 2

OSRAM ORIGINAL H4, halogen-headlamp bulb, 64193-01B, 12V, single blister (1 piece)

OSRAM ORIGINAL H4, halogen-headlamp bulb, 64193-01B, 12V, single blister (1 piece)

Osram H4 Original Line 12 V 60/55 W P43t 64193 2x Car Lamps

Osram H4 Original Line 12 V 60/55 W P43t 64193 2x Car Lamps

Bosch Headlight Bulbs Pure Light H4 12V 60/55W P43t (Bulb x2)

Bosch Headlight Bulbs Pure Light H4 12V 60/55W P43t (Bulb x2)

What Is An H4 Bulb?

H4 is one of the four most common tyres of car headlight bulb. That range also comprises H1, H3 and H7 bulbs too, as well as the H4 variety.

In general, think of car bulbs the same way as you would with bulbs in light fittings at home, with a code that identifies the socket (aka cap or fitting) they are designed for. With vehicle lights, the code, in this case H4, identifies the configuration of prongs that allow the bulb and fitting to work together.

H4 is unique among this family of headlight fittings in that it is a dual filament bulb. The filament is the thing strand of metal (wire) that electricity passes through to create the light. Dual filament means that there’s two wires in one bulb, a huge space saver in the headlight unit. It’s also convenient to be able to replace one bulb and know that you’re driving with beams (full beam and dipped beam) in top condition. The downside of course, is when one fails, both much be replaced.

Are 9003 And HB2 Bulbs Interchangeable?

You might see various similar bulbs with different codes on the market. The most common are HB2 and 9003. Generally speaking, these are interchangeable in the sense that they’ll work perfectly in an H4 socket in place of an H4 bulb, but they’re obviously not the same as they’ve got a different number assigned to them. The reason for the variations in otherwise similar bulbs is to meet different legal requirements around the world (for example the United States) where the bean patterns are (historically) very different to the UK. For that reason, it’s wise to stick to an H4 bulb in an H4 socket to be sure of legal compliance.