Collection: Head Light

Truck Headlights for Freightliner and Heavy-Duty Commercial Trucks

A cracked lens or a hazy, yellowed headlight on a semi isn't just cosmetic — it cuts down how far you can actually see at night, and a failed headlight is one of the quickest ways to get flagged at a roadside inspection. We stock truck headlights and headlamp assemblies built for Freightliner and other heavy-duty commercial trucks, and we ship worldwide. This collection focuses specifically on commercial truck headlight assemblies; for passenger car and general lighting, see our broader car lights collection.

Below is a rundown of the types of truck headlight assemblies out there, the usual signs one needs replacing, how to get the fitment right on a commercial truck, and the questions we hear most before people order.

Types of Truck Headlight Assemblies

A commercial truck headlight is a complete housing, not just a bulb — the lens, reflector or projector, bulb socket, and sometimes integrated turn signal or DRL housing all come as one assembly. The main distinctions:

• Halogen assemblies: the most common factory setup on heavy-duty trucks, using a replaceable halogen bulb inside a reflector or projector housing.
• LED assemblies: brighter, more efficient, and longer-lived, though they're not always a direct swap for a halogen housing since the connectors and sometimes the wiring differ.
• Single vs. paired listings: some headlights are sold individually by side (driver or passenger), others come as a left-and-right pair, often with bulbs included.
• Housing color: black or chrome housings are common on commercial trucks, mostly a cosmetic difference rather than a functional one.

Signs a Truck Headlight Needs Replacing

• A cracked or broken lens, which lets in moisture and dirt and will fog the inside of the housing over time.
• Yellowed, hazy plastic that cuts down on actual light output even with a good bulb installed.
• Visible moisture or condensation trapped inside the housing after rain or a wash.
• One side noticeably dimmer than the other, even after a bulb swap, which usually points to the housing or reflector itself.
• A headlight that fails a DOT roadside inspection for output, aim, or physical damage.
• A housing cracked or shattered from a road hit, rock strike, or minor collision.

How to Choose the Right Truck Headlight

Commercial truck headlights are far less forgiving on fitment than passenger car parts, because the same model name can span multiple body styles and years. A few things to confirm before ordering:

1. Exact model and body style. Many commercial trucks were built in more than one body generation during the same model year, and headlights from one generation generally don't fit the other.
2. OE part number. Match the number stamped or labeled on your existing housing against the listing — this is the most reliable way to confirm fitment on a commercial truck.
3. Halogen or LED. These use different connectors and sometimes different wiring, so confirm what your truck currently has before ordering a replacement type.
4. Side. Driver (left) and passenger (right) side housings are mirror images and not interchangeable — double-check which side you need.
5. Single unit or pair. If only one side is damaged, check whether the listing is sold individually before ordering two.

Buying Guide: Comparing Headlight Options

Option	Pros	Watch for
Halogen assembly (OE-style)	Matches factory look, straightforward bulb replacement, usually lower cost	Lower light output than LED
LED assembly	Brighter, longer bulb life, lower power draw	Connector and wiring compatibility with older trucks
Single-side listing	Cheaper if only one side is damaged	Confirm driver vs. passenger side before ordering
Left-and-right pair	Matched brightness and appearance on both sides	Higher upfront cost than replacing one side

Installing and Aiming a Truck Headlight

Swapping the housing itself is usually straightforward — disconnect the wiring harness, remove the mounting bolts or clips, and reverse the process with the new unit. The step people skip is aiming. A new headlight installed without checking the aim can blind oncoming drivers or leave a dark spot right where you need to see. Most truck shops can check and adjust aim quickly with the right equipment, and it's worth doing any time a headlight housing is replaced, not just when it feels obviously off. Check that any integrated turn signal or marker light wiring is reconnected correctly, since commercial truck headlight assemblies often combine multiple functions in one housing.

Frequently Asked Questions

Will a Freightliner headlight from one body style fit another year?

Not reliably. Body style changes within the same model line are common on commercial trucks, and headlights from one generation generally don't fit a different one. Match the OE part number or compare the housing shape before ordering.

Can I replace just one side instead of the pair?

Yes, if only one side is damaged and a single-side listing is available for your truck. Just confirm which side — driver or passenger — matches what you need.

Can I upgrade from halogen to LED?

Sometimes, but check connector and wiring compatibility first. Some LED assemblies are direct swaps; others need an adapter or additional wiring work.

Do commercial truck headlights need to be aimed after installation?

Yes. A misaimed headlight is a safety issue for you and oncoming traffic, and it can also fail a roadside inspection even if the light itself works fine.

Do you ship truck headlights worldwide?

Yes, we ship worldwide. See our shipping page for delivery estimates and track your order once it's moving.

Browse related categories: commercial truck parts, diesel truck parts, car body parts, and general car lights for passenger vehicle lighting. Not sure about fitment — contact us or use request a part.

Headlight Optics and DOT Compliance

Inside the housing, light gets shaped one of two ways. A reflector design uses a mirrored bowl behind the bulb to bounce and spread light forward — simpler and cheaper, common on older and mid-range assemblies. A projector design uses a lens and internal shield to focus light more precisely, usually producing a sharper beam cutoff that lights the road without blinding oncoming drivers as much. Commercial truck headlights sold for road use need to meet DOT (or regional equivalent) standards for beam pattern, output, and labeling — a legitimate replacement assembly will carry that certification, which matters both for safety and for passing inspection.

Bulb sockets vary by design too. Common types on heavy-duty trucks include H11, H13, and 9005/9006 halogen bulbs, along with sealed-beam units on older trucks that don't take a replaceable bulb at all. Confirm your truck's bulb type before assuming a new housing will use the bulb you already have on hand.

Caring for and Restoring Headlight Lenses

Modern headlight lenses are polycarbonate plastic, not glass, and they're coated with a UV-resistant clear coat from the factory. Over years of sun exposure, that coating breaks down and the plastic underneath yellows and hazes — this is a surface problem, not usually a sign the whole assembly has failed. Light cases can be improved with a headlight restoration kit: light sanding to remove the oxidized layer, polishing, and a fresh UV sealant coat. That said, restoration doesn't fix a cracked lens, a failed reflector, or moisture trapped inside the housing — those call for replacement, not polish. A coat of UV protectant applied periodically slows the yellowing process and is cheap insurance on a newer assembly.

Truck Headlight Glossary

• Headlamp assembly: the full housing — lens, reflector or projector, bulb socket, and sometimes integrated signal lights.
• DOT/SAE certification: regulatory standards a headlight assembly must meet for legal road use, covering beam pattern and output.
• Sealed beam: an older headlight design where the bulb and reflector are one non-replaceable sealed unit.
• DRL (daytime running light): a lower-intensity light, sometimes integrated into the headlight housing, that runs whenever the vehicle is on.
• Beam cutoff: the sharp edge in a low-beam pattern designed to light the road ahead without glaring into oncoming traffic.
• Housing: the plastic or composite shell that holds all the internal headlight components together.

Truck Headlights by Who's Buying Them

Owner-operators

A single damaged headlight on your own truck usually means replacing just that side, matching it to the OE part number so brightness and appearance stay even with the untouched side. Keeping a spare bulb or even a spare housing on hand isn't unreasonable if your truck has a history of rock strikes on a particular route.

Fleet maintenance

Fleets dealing with headlights across many trucks benefit from standardizing where possible — same part number across the fleet where body styles match means fewer SKUs to stock and faster turnaround when a truck needs to get back on the road. Buying pairs rather than single sides also keeps appearance consistent across a fleet's trucks.

Collision and body shops

A shop replacing a headlight after an accident needs to check more than just the housing — bent mounting brackets, damaged wiring harnesses, or a cracked bumper fascia around the light often come along with a hard enough impact to break the housing itself.

Common Mistakes When Buying Truck Headlights

• Assuming the model name alone confirms fitment. Commercial trucks frequently span multiple body generations under one model name — always check the OE part number or year range.
• Ordering the wrong side. Driver and passenger headlights are mirror images, not identical parts — double-check before you order.
• Mixing halogen and LED without checking compatibility. Some swaps need an adapter harness; assuming a direct plug-and-play fit can leave you with a light that doesn't work.
• Skipping the aim check after installation. A perfectly good new headlight aimed wrong is still a safety and inspection problem.
• Ignoring a foggy housing because the bulb still lights up. Trapped moisture degrades the reflector and bulb over time and won't resolve itself.

A Few More Questions We Get Asked

Why is my headlight foggy on the inside even though the bulb works?

That's usually a cracked lens, a failed seal, or a vent that's letting in moisture. It won't clear up on its own and tends to get worse, so the housing generally needs replacing rather than just cleaning.

Do bulbs come included with a headlight assembly?

It depends on the listing — some assemblies include bulbs, others are housing only. Check the specific listing before assuming either way.

How do I know if my truck has halogen or LED headlights currently?

Check your owner's manual, look up your VIN, or inspect the bulb itself if you can access it — halogen bulbs have a visible filament, LED units don't.

Why Buy Truck Headlights From Us

We list the OE part number and side on every truck headlight listing, not just a generic photo, so you're not guessing before you order. We ship worldwide, with tracking available through track order. Our warranty page explains what's covered, and returns covers the process if a part doesn't fit. Not sure about your exact body style or part number — contact us and we'll help confirm it, or use request a part if you don't see what you need listed yet.

For more on how headlamps and beam patterns work, the Wikipedia article on the headlamp covers the history and design in depth. Once you've confirmed fitment, the truck headlights above are ready to ship.

Built for the Road: Vibration, Weather, and Duty Cycle

Commercial trucks live a rougher life than the average passenger car, and headlight assemblies built for them have to account for it. Long highway miles mean constant vibration through the chassis and cab, which over years can loosen mounting points or crack a brittle housing that a car headlight would never experience. Weather exposure is more extreme too — long-haul routes cross through heat, cold, rain, and road salt in the same week, and a housing's seals and gaskets take that abuse continuously rather than in the occasional short trip a passenger car sees. That's part of why OE-matched replacement parts, built to the same tolerances as the original, tend to hold up better long-term than a generic universal-fit housing that wasn't engineered for a specific truck's mounting points and vibration profile.

Repair or Replace: Making the Call

Not every headlight problem means buying a new assembly. A dim bulb with an otherwise clear, intact housing is often just a bulb replacement — cheap and quick. A hazy but uncracked lens can sometimes be restored rather than replaced, at least for a while. Where replacement becomes the right call: a cracked or shattered lens, visible moisture trapped inside the housing, a reflector that's degraded or peeling, or a connector that's melted or corroded beyond a simple cleaning. If you're not sure which category you're in, a quick inspection with the truck off and cool, checking for cracks, trapped moisture, and connector condition, usually makes it clear.

How Truck Headlight Technology Has Changed

Older heavy-duty trucks mostly ran sealed-beam headlights — a single unit combining bulb and reflector with no replaceable parts, simple and tough but limited in brightness and impossible to upgrade. Halogen assemblies with replaceable bulbs became the standard for a long stretch after that, offering better output and the ability to swap just the bulb instead of the whole unit. LED has become more common more recently, offering brighter, whiter light and a much longer service life than a halogen bulb, though not every older truck's wiring and housing design accepts a direct LED swap without some adaptation. Knowing where your truck sits in that progression helps set expectations for what a replacement or upgrade actually involves.

One More Thing Worth Checking

If your truck has had headlight trouble more than once on the same side, it's worth checking the wiring harness and connector, not just replacing the housing again. A corroded or loose connector can cause flickering, dimming, or premature bulb failure that looks like a housing problem but isn't, and replacing the assembly a second time without addressing the wiring just means doing it a third time later.