On the outside, there is absolutely no difference between H4 and 9003. Both share the same housing, the same dual-filament internals, and the same three-pronged connection. So, of course, they are interchangeable, i.e., installing a 9003 bulb in a vehicle equipped with H4s, and vice-versa.

Is H4 and 9003 the same bulb?

On the outside, there is absolutely no difference between H4 and 9003. Both share the same housing, the same dual-filament internals, and the same three-pronged connection. So, of course, they are interchangeable, i.e., installing a 9003 bulb in a vehicle equipped with H4s, and vice-versa.

Are HB2 and 9003 the same?

The H4, HB2, and 9003 are essentially all the same bulb and can be used interchangeably.

What does H4 mean in car lights?

H4 lamps used to be the standard light sources in vehicles. These are the so-called bilux lamps. This simply means that there are two filaments in the bulb: one for the low beam and one for the high beam.

Are all 9003 bulbs the same?

9003 and H4 bulbs look alike, fit in all the same headlamps, have the same wattage rating and seem to be completely interchangeable, but in some places, the law says that only one or the other type must be used.

Are all H4 bulbs high and low beam?

H4 Bulbs. H4 bulbs contain two filaments, giving them the option of being either high- or low-beam lights. The bulb has a three-pronged attachment to the wiring harness.

What do H4 headlight bulbs fit?

These two bulbs are virtually the same. The H4 model has a slightly shorter tab, but an H4 bulb will fit into a 9003 socket.

What is H4 headlight bulb?

H4 Bulbs. H4 bulbs contain two filaments, giving them the option of being either high- or low-beam lights. The bulb has a three-pronged attachment to the wiring harness. Originally developed for European race cars, these bulbs are very bright and can give off white, blue, violet or yellow light.

Are H3 and H4 bulbs interchangeable?

All of the bulbs discussed in this post – H1, H3, H4, H7, H11, HB3, and HB4 – are in Group 1. These bulbs are primarily used as headlights due to this classification. Even though these bulbs are in the same category, they’re not interchangeable. This means that you must stick to the bulb fitting that your vehicle uses.