If you drive an F-350 Super Duty, chances are it works as hard as you do. Towing, hauling, plowing, and long drives home after dark all come with the job. The factory halogen bulbs, though, were never the strong point. After a few Canadian winters, most owners notice the same things: yellow, dim light, a beam that stops short, and bulbs that burn out faster than they should.

The good news is that an LED upgrade for Ford F-350 is one of the easiest improvements you can make, and you can usually do it in your own driveway. This guide keeps things simple. You'll find the bulb code for every F-350 from 1999 to 2020 (most are H13/9008, with 9007 on the early years), our recommended LED series for each position, and straight answers to the questions Canadian drivers ask most.

Check the F-350 Bulb Fitment Before Choosing a Product

Ford F-350 Super Duty bulb fitment can change with the model year, trim and factory lighting package. The truck may use one dual-beam bulb for both high and low beams, separate bulbs for each beam, or an integrated LED assembly with no conventional replaceable headlight bulb.

To find out, check your vehicle owner’s manual, use the Ford F-350 Super Duty bulb finder, inspect the number on the original bulb and compare the connector before purchasing.

Best LED Headlight Bulbs for Ford F-350 Super Duty

SEALIGHT S7S: Higher Output for Night Work and Towing

The SEALIGHT S7S LED headlight bulbs are the higher-output choice in this comparison. They are most relevant to F-350 owners who spend long periods on unlit highways, enter remote worksites before sunrise or tow after dark.

Choose the product by the original socket and beam layout:

The product pages list 6500K white light and fan cooling. Before choosing S7S, check the room behind the bulb and make sure the dust cover can close without pressing against the fan or wiring. A high-output bulb still needs to sit at the correct angle in the housing to produce a useful beam.

On an F-350, headlight aim deserves extra attention. Trailer tongue weight, payload and suspension changes can alter the truck’s stance. If the front end points higher after the truck is loaded, an otherwise controlled beam may shine too high. Check the aim with the truck in its normal operating condition.

SEALIGHT Scoparc S1: Practical Choice for Daily and Fleet Use

The SEALIGHT Scoparc S1 LED headlight bulbs are better suited to owners looking for a straightforward, lower-cost upgrade for commuting, service routes and regular evening driving. They make more sense when maximum advertised output is not the main buying factor.

Available mapped options include:

For work fleets, consistency can be more useful than selecting the highest-output bulb for every truck. Record each vehicle’s year, trim, factory headlamp type and installed bulb number. That prevents a 9007, H13 or 9005/H11 kit from being ordered for the wrong unit.

Best LED Fog Light Bulbs for Ford F-350 Super Duty

Factory fog lights illuminate the area closer to the road and can help define lane edges and shoulders in poor conditions. They should complement properly aimed low beams rather than replace them.

The SEALIGHT XF3 LED fog light bulbs are the higher-output fog light recommendation from the original guide. For a compatible factory fog lamp, the SEALIGHT XF3 H10/9145 LED fog light bulbs are listed at 6500K with IP68 protection.

Do not assume every F-350 uses H10/9145 fog light bulbs. Some trucks use a different bulb, a different lamp package or no factory fog lamps. Confirm the original socket and inspect the housing seals before installation. Water resistance at the bulb does not repair a cracked lens or a damaged housing seal.

Bright white light can also reflect from falling snow, blowing snow or dense fog. In those conditions, correct aim, moderate speed and a clean lens matter more than output alone. Keep snow and road film off the fog lamp lenses during winter trips.

Other F-350 Lights Worth Checking

An F-350 used with a long trailer, service body or equipment in the bed creates visibility needs beyond the front lamps.

  • Reverse lights: The Ford F-350 LED reverse light bulbs page helps narrow options for the truck’s original sockets. Clearer rear illumination can be useful when aligning a hitch or backing into a dark work area, but it does not replace functioning trailer reverse lamps.
  • Brake and tail lights: Use the Ford F-350 brake and tail light bulbs page to check compatible rear signal bulbs. Match the required colour, intensity function and socket.
  • Turn signals: The Ford F-350 LED turn signal bulbs page lists options by vehicle position. Some LED replacements may flash too quickly or trigger a warning, so test both sides after installation.
  • Interior lights: The Ford F-350 interior LED bulbs page is relevant for crew cabs and work trucks where the cabin is frequently used before dawn or after dark.

Check whether each location uses a removable bulb. An integrated LED lamp requires a different repair approach from a conventional socketed bulb.

Installation Checks for Canadian F-350 Owners

Inspect the Housing Before Blaming the Bulb

A cloudy lens, corroded connector or moisture inside the housing can reduce performance. Inspect these parts before installing an LED replacement. On trucks exposed to road salt, look closely at connectors and seals rather than assuming dim output comes only from an ageing halogen bulb.

Keep the Dust Cover and Retaining Hardware Intact

The bulb must lock securely into the housing, and the dust cover must close correctly. Do not cut tabs, force a connector or leave the housing open to fit an incompatible bulb. Check clearance for the heat sink, fan and wiring before completing the installation.

Test Every Lighting Mode

After installation, test low beam, high beam, daytime running light operation and any automatic-lighting functions. Some vehicles may flicker, show an error or fail to light in one mode. Contact SEALIGHT support with the truck’s full details and the affected function if troubleshooting is needed. A decoder cannot correct the wrong base, connector or installation structure.

Recheck Aim When the Truck’s Load Changes

Check beam aim on level ground after the upgrade. For an F-350 that routinely carries a service body, slide-in equipment or trailer tongue weight, evaluate the beam with the truck close to its usual working load. This helps identify an aim problem caused by vehicle stance rather than the bulb itself.

Frequently Asked Questions

What Headlight Bulb Size Does a Ford F-350 Super Duty Use?

There is no single headlight bulb size for every Ford F-350 Super Duty. Depending on the headlamp system, replaceable applications may use 9007/HB5, H13/9008, 9005/HB3, H11/H9/H8 or another size. Check the original bulb and use the vehicle selector before ordering.

Can I Replace Factory LED Headlights With LED Bulbs?

Not if the truck has an integrated factory LED headlamp without a replaceable bulb. The products in this guide are intended for compatible housings that accept removable bulbs. Confirm the headlamp design before purchasing.

Does a Dually F-350 Use Different Headlight Bulbs?

Dual rear wheels alone do not determine headlight bulb size. The correct bulb depends on the model year, trim and factory headlamp assembly. Verify the original bulb even if another F-350 dually from the same generation appears similar.

Will LED Turn Signal Bulbs Cause Hyper Flash?

They can on vehicles that detect the lower electrical load of an LED as a failed bulb. Test the signals after installation. If they flash too quickly or show a warning, contact SEALIGHT support for model-specific troubleshooting.

Final Recommendation

For an F-350 that frequently tows or works on unlit roads, start by comparing a correctly sized S7S bulb with the factory lighting setup. For daily driving or fleet replacement, the S1 series is the more budget-focused option. If the truck has replaceable H10/9145 factory fog light bulbs, XF3 provides a matching higher-output fog light option.

The best upgrade is not simply the product with the largest output figure. It is the bulb that matches the F-350’s exact socket, fits inside the housing, works across every lighting mode and maintains a controlled beam under the truck’s normal load.