Looking for the correct 2023–2026 Ford Super Duty bulb size for an F-250, F-350, F-450 or F-550 equipped with factory halogen headlights?
This guide covers the common replaceable exterior bulb sizes for 2023, 2024, 2025 and 2026 Ford Super Duty trucks with the factory halogen headlight configuration, including XL, XLT and other applicable trims equipped with halogen headlights.
You’ll find the correct bulb sizes for the low beams, high beams, fog lights, turn signals, side markers, reverse lights, cargo lights, third brake light and license plate lights. We’ll also cover LED fitment, installation, dust-cover clearance, beam pattern and how to choose the correct LED upgrade.
Quick Navigation
- 2023–2026 Super Duty Bulb Size Chart
- Headlight & Fog Light Bulb Sizes
- Rear Lighting Bulb Sizes
- Interior Lighting
- Recommended LED Upgrades
- F1 Series Fitment & Installation
- LED Output & Beam Pattern
- Frequently Asked Questions
2023–2026 Ford Super Duty Bulb Size Chart
The chart below provides a quick reference for the replaceable bulbs used on the factory halogen-equipped trucks covered by this guide.
| Lighting Position | Bulb Size | LED Upgrade |
|---|---|---|
| Low Beam Headlight | H11 | Shop H11 LED Bulbs |
| High Beam Headlight | 9005 / HB3 | Shop 9005 LED Bulbs |
| Fog Light | H11 | Shop H11 LED Bulbs |
| Front Turn Signal | 4257 | No FUZED LED replacement currently |
| Front Side Marker | 194 / T10 | Shop 194 LEDs |
| Reverse Light | WT21W or 3157 | Verify factory bulb before ordering |
| Cargo Light | 921 | 921 LED Upgrade |
| Third Brake Light | 921 | 921 Red LED Upgrade |
| License Plate Light | 194 / T10 | 194 LED Upgrade |
Fitment reminder: Always verify your factory lighting configuration before ordering. If your truck has aftermarket headlights, use the bulb size specified by the manufacturer of the aftermarket headlight assembly rather than assuming the factory chart applies.
2023–2026 Super Duty Headlight & Fog Light Bulb Sizes
Low Beam Headlight — H11
The factory halogen low beam bulb size is H11 on the 2023–2026 Super Duty trucks covered by this guide.
For LED upgrades, you can compare our current H11/H8/H9 LED bulb options to choose the output level that works best for your truck.
The H11 low beam is one of the most important upgrades for nighttime visibility because it is the primary headlight used during normal nighttime driving.
High Beam Headlight — 9005 / HB3
The factory halogen high beam bulb size is 9005/HB3.
See our 9005/HB3 LED bulb collection for compatible LED high-beam upgrades.
The high beams are designed to provide additional forward illumination when driving conditions allow and there is no approaching traffic that could be affected by the high beams.
Fog Light — H11
The factory replaceable fog light bulb size is H11 for the halogen configuration covered by this guide.
Because the low beam and fog light positions both use the H11 bulb family, always make sure you are ordering the correct product for the lighting position you intend to upgrade.
View FUZED LED H11 bulb options →
Front Turn Signal — 4257
The front turn signal bulb size is 4257.
FUZED LED does not currently offer an LED replacement for this application. We recommend keeping the correct factory bulb in this position rather than substituting an unverified bulb.
Front Side Marker — 194 / T10
The front side marker uses a 194/T10 bulb.
Shop compatible 194/T10 LED bulbs →
2023–2026 Ford Super Duty Rear Bulb Sizes
Reverse Light — WT21W or 3157
The reverse-light application can use either a WT21W or 3157 depending on the truck's factory configuration.
FUZED LED currently offers a 3156/3157-family LED reverse-light option, but we do not currently offer a replacement for the WT21W application.
Cargo Light — 921
The cargo light bulb size is 921.
Shop 921 LED cargo light bulbs →
Third Brake Light — 921
The third brake light uses a 921 bulb.
Shop 921 red LED third brake light bulbs →
License Plate Light — 194 / T10
The license plate lights use 194/T10 bulbs.
Shop FUZED LED 194/T10 license plate bulbs →
2023–2026 Super Duty Interior Lighting
Some lighting positions inside these trucks use integrated factory LEDs rather than conventional replaceable bulbs.
| Interior Position | Factory Lighting |
|---|---|
| Map Lights | Factory LED — Not Replaceable as a conventional bulb |
| Rear Dome Light | Factory LED — Not Replaceable as a conventional bulb |
Recommended LED Upgrades for 2023–2026 Super Duty Halogen Headlights
If your truck is equipped with the factory halogen headlights covered by this guide, the two primary headlight bulb sizes are:
- Low Beam: H11
- High Beam: 9005/HB3
Instead of forcing every driver into one output level, you can compare the available FUZED LED bulb options and choose the series that fits your needs.
Shop 9005/HB3 High Beam LED Bulbs →
FUZED LED F1 Series Fitment & Installation
One of the major concerns when upgrading modern truck headlights to LED is rear clearance inside the headlight housing.
On the Super Duty halogen headlight configuration covered here, our F1 Series LED replacements fit inside the factory headlight assembly and allow the factory rear dust covers to be reinstalled.
Reinstalling the dust covers after the LED bulbs are installed is important because the covers are part of the factory headlight enclosure.
Below is a view of the F1 Series fitment inside the Super Duty headlight housing.
Installation tip: After installing the bulbs, confirm that each bulb is fully seated and locked in place before reinstalling the dust cover.
LED Output & Beam Pattern
More light output is only useful when that light is properly controlled by the headlight housing.
FUZED LED F1 Series bulbs are designed to increase usable light output while maintaining the factory housing's beam pattern. The goal is to increase the amount of useful light projected onto the road rather than simply creating uncontrolled glare.
For the best beam performance, the LED bulb must also be installed and seated correctly inside the headlight assembly.
After installation, check the low-beam cutoff and headlight aim against a wall before driving at night. If the headlight assembly has been moved or adjusted, verify the headlight aim before normal road use.
Will FUZED LED Bulbs Fit Behind the Factory Dust Covers?
For the factory halogen headlight configuration tested here, the FUZED LED F1 Series bulbs fit inside the headlight assembly and the factory dust covers can be reinstalled after installation.
This is important because some oversized aftermarket LED bulbs can create rear-clearance problems inside factory headlight housings.
2023–2026 Ford Super Duty Bulb Size FAQs
What size is the low beam bulb on a 2023–2026 Ford F-250 with halogen headlights?
The factory halogen low beam uses an H11 bulb on the trucks covered by this guide.
What size is the high beam bulb on a 2023–2026 Ford Super Duty?
The factory halogen high beam bulb size is 9005/HB3.
What size fog light bulb does a 2023–2026 Ford Super Duty use?
The replaceable halogen fog-light application covered by this guide uses an H11 bulb.
Do the low beam and fog lights use the same bulb size?
Yes. On the halogen configuration covered by this guide, both the low beam and fog light positions use an H11-family bulb. The bulbs are installed in different lighting positions, so always verify which position you are upgrading.
Will LED headlight bulbs fit behind the factory Super Duty dust covers?
The FUZED LED F1 Series bulbs tested in this factory halogen headlight configuration fit inside the headlight assembly and allow the factory rear dust covers to be reinstalled.
Does this guide cover factory LED headlights?
No. This guide is specifically for 2023–2026 Ford Super Duty trucks equipped with factory halogen headlights. Factory LED headlight systems use a different lighting configuration.
Does this guide cover the Ford F-250, F-350, F-450 and F-550?
Yes. This bulb chart is intended for the factory halogen-equipped Ford F-250, F-350, F-450 and F-550 configurations covered by this guide for model years 2023 through 2026.
Why are two different reverse-light bulb sizes listed?
Both WT21W and 3157 reverse-light applications are possible. Check the existing bulb in your truck before ordering. FUZED LED currently offers an LED option for the compatible 3157 application but does not currently offer a WT21W replacement.
What bulb size is the Super Duty cargo light?
The cargo light bulb size is 921.
What bulb size is the Super Duty license plate light?
The license plate light bulb size is 194/T10.
Before Ordering LED Bulbs for Your Super Duty
Before purchasing replacement bulbs, verify these four things:
- Model year: 2023, 2024, 2025 or 2026
- Truck model: F-250, F-350, F-450 or F-550
- Headlight type: Factory halogen headlights
- Existing bulb size: Confirm the bulb in the position you are upgrading
If your truck has aftermarket headlights, do not assume this factory bulb chart applies. Use the bulb specifications provided by the headlight manufacturer.
Low Beam: Shop H11 LED Headlight Bulbs
High Beam: Shop 9005/HB3 LED Headlight Bulbs
2 comments
Michael
Hey Don! No, our f1 series LED bulbs don’t cause any errors or issues with the system in these trucks!
Don
Will the headlight swap for 2023 f250 cause any error light issues