What Does an H13 Bulb Fit? | Socket And Vehicle Match

An H13 bulb fits any headlamp assembly built for the H13/9008/P26.4t socket, used for both low and high beam.

Wondering whether an H13 bulb fits your truck or SUV comes down to one thing: the socket. The H13 is a dual-beam halogen bulb, and its fitment depends entirely on the headlamp housing and connector, not on the brand of your vehicle. The bulb works in any assembly designed for the H13/9008/P26.4t family, so the real question is what your specific headlight housing accepts.

The H13 Base: One Socket, Three Names

The H13 base is known by a few names depending on the catalog: H13, 9008, and sometimes H13ST or H13XV. In the United States, H13 is widely treated as the equivalent of 9008. The base is a P26.4t, and the bulb runs on 12 V with dual filaments for both low and high beam.

While the names differ, the geometry is the same. A bulb labeled H13 or 9008 uses the same socket and keying, so a 9008 bulb fits an H13 housing and vice versa. The key detail is the locking tab arrangement on the base, which prevents you from inserting the bulb incorrectly. As long as your headlamp assembly uses this socket, the physical fit is correct.

One caution: the H13’s dual-beam design means you cannot replace it with a single-beam bulb type, since that would leave you without either low or high beam function.

Which Vehicles Use the H13 Socket?

Reference guides describe the H13 as a common dual-beam bulb on domestic trucks and SUVs, though fitment varies by year, make, and model. Even within the same vehicle line, different trims and model years can use different bulb types for the same headlamp position.

To confirm your vehicle uses the H13/9008 socket, check three places:

• The old bulb itself — the code is printed on the metal base.
• Your owner’s manual, which lists the correct bulb for each position.
• The underhood label, which often shows the approved bulb numbers.

After confirming the socket, verify both low and high beam requirements separately. Some vehicles use different bulb sizes for each beam, and an H13 only fits assemblies designed for its dual-beam layout. If your truck uses the same H13/9008 socket on both sides, the replacement is straightforward.

What Are the H13 Specs and Life Expectancy?

The standard H13 halogen bulb operates at 12 V with a nominal wattage of 60/55 W, drawing a bit more power for high beam than low. The P26.4t base locks into the socket with a specific keying, and the bulb’s physical dimensions are compact enough for most factory housings. A typical H13 measures roughly 89–93 mm in overall length and about 16–17 mm in diameter, though these figures vary slightly by manufacturer.

Light output and lifespan depend heavily on the specific product. OSRAM’s ORIGINAL LINE H13 lists about 1500/1000 lm at 13.2 V, while VOSLA’s +100 product claims 1700/1100 lm. Lifespan varies even more: OSRAM rates its standard H13 at up to 1290 hours on high beam, whereas VOSLA’s brighter +100 model lists a much shorter 100–200 hours in its own data. A premium bulb that shines brighter often trades away longevity.

One spec-sheet trap: some manufacturers list higher power-input figures like 75/68 W. That is a test-condition measurement at 13.2 V, not the nominal rating. In real-world use at the vehicle’s regulated ~12 V, the draw sits near the standard 60/55 W, so the extra number shouldn’t alarm you.

How Do You Install an H13 Bulb?

Replacing an H13 is a simple job if you follow the right order. The steps below work for most factory housings.

1. Read the manufacturer instructions for your specific bulb before touching anything.
2. Disconnect the battery (or at least the light circuit) to reduce electrical risk while you work.
3. Remove the old bulb, checking your vehicle manual if the access cover isn’t obvious.
4. Insert the new H13 fully and push until it seats securely in the socket, then lock it in place.
5. Test low and high beam to confirm the bulb is seated and both filaments work.

One mistake that kills halogen bulbs fast: touching the glass with bare fingers. Skin oils create hot spots on the quartz envelope, which can shorten the bulb’s life considerably. Hold the bulb by its metal base only. If you do touch the glass, wipe it clean with isopropyl alcohol before installing.

What About H13 LED or HID Conversions?

LED and HID retrofit kits for the H13 socket exist, but they come with real caveats. The H13’s dual-beam design means a single-beam LED chip won’t work; you need a kit with separate emitters or a movable shield for low and high beam. You’ll also need room behind the housing for the cooling fan or driver, and you must check whether your state allows aftermarket beam patterns. The Sylvania bulb finder shows which vehicles use the 9008/H13 socket, but legality and housing clearance are still on you. If you’re ready to upgrade, our roundup of tested H13 headlight bulb picks covers which options actually fit and perform.