Commercial Semi Truck Lighting Guide

Buying the right aftermarket semi truck lighting is important to any owner-operator or fleet owner who prioritizes their rig’s performance and style. But which one is the right choice? 

In this guide, we’ll cover the three primary types of lights: LED, Halogen, and HID - alongside style choice options for interior cab lighting, turn signal lights, and marker accent lighting.

We’ll also cover DOT rules/regulations and use cases for the type of truck driving you’re doing.

Semi Truck Headlights 101 – The Big 3 Bulb Types

HID vs Halogen vs LED: What’s the Difference?

1. Halogen: The most common and affordable option, though they have the shortest lifespan (under 1,000 hours). These are standard on older models and offer a wide variety of warm color temperatures.

2. HID (Xenon): These emit a cooler, blue-white light and offer 2–3x the output of halogen. They require ballasts and a few seconds of "warm-up" time to reach full brightness.

3. LED: The industry standard for 2026. LEDs are highly efficient, instant-on, and last up to 30,000+ hours. In northern climates, look for heated LED headlights to prevent lens icing during winter hauls.

• Heated LED headlights: Solves the icing problem; ideal for extremely cold climates.

LEDs (light-emitting diodes) have become the industry-wide staple in commercial truck lighting. However, HID (usually bright white or blue) headlights are a close second.

The majority of headlights on older truck models are halogen. But newer truck models largely lean on LEDs. 

Lighting:	HALOGEN	LED	HID (XENON)
Light Output	weakest ouput	second-strongest	strongest output
Energy Efficiency	Least efficient	Max efficiency	More efficient
Lifespan & Durability	under 1,000 hrs	50k-100k > hrs	500-1,000 hrs
Warm-up Time	instant	instant	longest

Semi truck headlights come with low- and high-beam settings.

Low beam for nighttime driving, angled downwards to avoid shining light onto oncoming drivers.

High beam is for greater distances, like long stretches of rural highway with minimal traffic. 

Watts. When you're replacing lights on your truck, make sure you get the right wattage level. If you buy a bulb that has a higher wattage, you'll need a thicker gauge, otherwise it'll melt your wire.

Brightness & Color. The lumen rating indicates the preferred brightness. Check the Kelvin (K) values for color temperatures

Exterior Lighting Breakdown for Class 8 Trucks

LED Clearance & Marker Lights

Rear cab marker lighting is designed to prevent collisions by improving nighttime visibility. 

Marker accent lighting can be placed nearly ANYWHERE on your truck - especially any stainless steel trim pieces or chassis-mounted side fairings. 

Adding lighting to some areas of the truck is more functional than others.

Adding step tool box lights will help you see where you step in the dark. Pretty useful. 

The Top Marker Light Style Options

The style choices for semi truck cab lighting/marker lighting are nearly limitless. You can have multiple diodes, dual-function setups that will switch colors, and black, chrome or clear housings with various bulb colors. 

These lighting options vary dramatically, be it the number of diodes, the pattern, shape, or lens style. 

Glo Light marker lights offer a distinctive glowing effect that utilizes different lens shapes, sometimes round and flat, and other times jeweled watermelon styles. 

Color changing dual function lighting styles allow you to meet the legal requirements for truck light colors while adding more personalization and style to your truck. 

Mirage style LED lighting has a textured lens pattern that creates an infinity-mirror effect, adding greater dimensionality to the light's appearance. 

Spyder lights are the most common of all LED marker lights. These provide a very modern, sleek look at night.

These are used pretty much all over the truck: marker/clearance, turn signal, underglow, step box, and even some headlight designs. 

Abyss marker lights are similar to mirage lights, both of which offer a similar infinity vision effect. This style is also used for turn lights, brake lights, and backup lights. 

Tunnel style marker lights add some dimensionality and visual depth that can give a retro vibe wherever you choose to place it. 

Mirror Back-Mounted Accent Lighting

Reflective mirror light backings can pair nicely with the rest of your clearance/marker light upgrades, matching the overall tone of your rig. 

Underglow LED Strip Lighting

These are strictly decorative lights that attach along the chassis frame and are a stylish option for greater levels of aftermarket customization. 

Air Breather Light Panels

Air cleaner light panels can be fitted with all sorts of LED lighting styles, from watermelon lights, penny lights, or round/oval light options. You can customize the light spacing, shapes, color, and size diameter for your make/model. 

Rear-facing air breather light panels can be dual-purpose, serving as turn signal lights and marker lights at the same time. 

Turn Signals & Combo Fender-Mount Lights

Fender-mounted combo lights can serve as both a marker light and turn signal light, depending on how you want to set up your wiring. 

Front and rear-fender semi truck lights are yet another great option that can drastically add to your visibility and style.

Fender-mounted clearance/turn lights can mount on top of the fender or come integrated with pre-fit light-hole cutouts in stainless steel or fiberglass fender material. 

Some styles feature a double-facing light - red color lens for the back and an amber lens for the front. 

Yes, like most exterior lights, you can choose the shape you want, rounded or squared! 

You can even add small oval or rounded lights to your front fender guards. 

License Plate Frame Accent Lighting

License plate trim lighting serves as a great finishing touch to exterior marker lighting upgrades for your truck's rear.

The available style options can vary quite a bit, from the light spacing, shape/size, and trim finish. 

Try an oval or square shape lighting style on the bottom or top of the license frame surround trim. 

Try going with a full-width Glo lighting style on the bottom portion of the license trim. 

Back-Up Semi Truck Lighting 

Rear T-Bar Lighting

Whether you're upgrading with a stainless steel bar or a smaller rear panel, the lighting fixture styles you can choose from are 100% up to you - down to the shape, spacing, diameter size, and more. 

Fog Lights vs Driving Lights

Driving lights offer a narrow and far-reaching beam and are mounted on the roof or visor. 

Fog lights have a wide low beam pattern and are mounted to the low bumper or grille 

Commercial Strobe Lights & Beacon Lights for Utility Use

Strobe lights and beacon lights are designed for visibility and safety, not so much aesthetic appeal. 

Full-Size Warning Lights & Mini Light Bars (High Intensity)

These full-size light bars provide a wall of light for oversized loads, tow trucks, and service rigs to be sptted from a great distance.

Brands like United Pacific, Aftermarket, Trux, and Star Headlight offer various light bar sizes. It depends on your preference. 

• 49" High Power LED Bar by United Pacific
• 58" Phazer LED Tow Bar by Star Headlight
• 15" Octagonal Mini Bar by Aftermarket
• 14" SAE Class 1 Profile by Trux Accessories

Beacon & Puck Lights (360° Visibility)

Perfect for cab roofs or rear-rack mounting to give off 360-degrees of visibility while you're parked on the shoulder of the road. These are often permanent mounts, not magnetic. 

Premium Standard-Profile Beacon Lights:

• Star Signal Tall Beacon: Permanent or Pipe Mount
• Trux Class 1 Medium Profile: 36 Flash Patterns
• Maxxima S.A.E. Class 1: 4.6" x 6.4" Amber LED

Micro & Low-Profile Beacons:

• Trux 6" Low Profile: S.A.E. Class 1 
• United Pacific 4 Watt: Magnet Mount
• Maxxima 2.6" x 3" Amber: 12 Flash Patterns

Surface-Mount & Perimeter Strobe Lights

Used for hide-a-way kits or to mount directly to the grille, bumper, roof, or side of the sleeper. These are ideal for a low-profile permanent integration that fills blind spots on your exterior lighting profile. 

Directional & Perimeter Lights:

• United Pacific 18 LED: 26.5" Bar with Arrow Patterns
• Hide-A-Star Remote Kit: Spherical or Directional Heads 
• Trux 6 Diode Surface Mount: 36 Patterns

Ultra-Thin / Slimline:

• Maxxima 4 Diode Ultra Thin: Clear Lens/Amber LED
• Automann Mini Slimline: 1-inch LED Strobe
• TowMate SS470 Series: Ultra Low Profile

Portable Warning Lights:

These products are a great choice if you're moving from one rig to another and need a backup emergency light in your console or storage space. 

Portable & Logger Lights:

• Fox Fire Logger Kit: 4-piece Magnetic Portable Kit
• Foxfire Premium Logger Light: Side-facing LEDs, Battery-operated

Strobe Light Mounting Brackets & Intallation Hardware

You can explore mounting hardware that ranges from high to low-priced options:

• Merritt Cab Rack Brackets: Aluminum Bracket for Cab Racks
• Roadworks Beacon Bracket: 7" x 7" Stainless Steel
• Chrome Shop Mafia (CSM): Stainless Steel Beacon Bracket
• Aftermarket Mirror Mount: Stainless Mirror-Post Bracket

Replacement Strobe Light Components

Strobe lights spin at specific intervals. If the internal hardware is damaged, it won't spin. You can replace the rotator assembly quite easily, however: 

• Replacement Strobe Tube: For 9200/9400 Series Bars
• Replacement Rotator & Rotator Assembly: Star Headlight & Lantern Co.

The Benefits of Running Strobe Lights on Your Truck

Aside from the obvious (higher visibility = more safety), here are some of the top features of strobe lights and how they benefit you as a professional driver. 

SAE Class 1 Rating: Delivers the highest intensity (approx. 4x brighter than Class 2), required for emergency and primary highway utility vehicles.

IP67/68 Waterproofing: Stops moisture from entering the housing and fogging up the light.

Low Amp Draw (LED): You can run your strobes during a long breakdown without worrying about the truck failing to crank in the morning.

Flash Pattern Memory: Saves your favorite "attention-getter" so you don't have to cycle through 30 patterns every time you turn them on.

Interior Sleeper Cab Lighting

Interior cab lighting can accentuate any part of your truck, from the cab roof to the driver or passenger-side handles, and flooring.

The style of interior accent trim lighting depends on what your particular make/model design will allow for. You can customize it by color (no regulatory color requirements inside your own cab), shape, spacing, and base finish (stainless steel or powder coated). 

If you're doing a sleeper cab conversion and you're looking to truly customizing your interior space, you can add lighting to the various trim cutouts for your windows or speakers while you're at it. 

You can personalize your style even more by adjusting your interior cab light color options in hues like purple, green, amber, red, white, or any other color mixtures that might match your interior upholstery, trim accent pieces, and covers. 

You can even do some backlit flooring lighting in the cab space. 

Custom sleeper lighting allows you to create a truly one-of-a-kind cabin environment.

You can select for the type of finish on your housing/base (polished stainless steel or painted aluminum)- and swap out your lens style, be it a grakon, beehive, bullet, or watermelon-style lighting setup. 

Quick-Hit List of DOT/FMVSS Truck Lighting Requirements

• Headlights: White, two minimum; high and low beam required.
• Turn Signals: Amber front, red or amber rear; visible at wide angles.
• Brake Lights: Red, two required; must be bright and function with the brake pedal.
• Tail Lights: Red, steady burn with headlights.
• Clearance Lamps: Amber (front/top corners), red (rear/top corners) for trucks over 80” wide.
• ID Lamps: Three-lamp cluster (amber front, red rear) for wide vehicles.
• Side Marker Lamps: Amber (front/center), red (rear); required for longer vehicles.
• Reflectors: Amber (front/sides), red (rear/sides); must be visible at night.
• License Plate Light: White lamp must illuminate plate from 50 ft.
• Backup Light: At least one white light activated in reverse.

Understanding Color Laws & Legal Limits

DOT/SAE Color Regulations for Truck Lights

Light Position	DOT/SAE Color	Light Uses
Front-Facing	White/Yellow	Headlamps, turn signals
Side-Facing	Amber	Clearance, marker, turn signal
Rear-Facing	Red	Tail, stop, rear turn lights
Blue/Green/Purple	Emergency Only	Only allowed as dual light setup

Common Violations to Avoid

• Amber rear stop or tail lights
• Blue lights on non-emergency rigs (unless they're blue/amber duo lights)

Truck Show vs Compliance Lighting 

• Show trucks often add extra lights for aesthetic purposes
• Decorative lighting must follow DOT color rules - amber front/side, but never blue 

Snap-Shot of Regulatory/Safety Rules for Truck Lights 

• All lighting must meet DOT/FMCSA regulations.
• Only use approved colors: white/amber front/sides, red rear.
• No flashing, colored, or blinding lights unless legally allowed (e.g., strobes for roadside emergencies).
• FMCSA annual inspections require all lights to function properly.
• DOT-compliant lights should have "DOT" or "SAE" markings on the lens.

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DOT Compliance and Inspection Readiness

Here's what you need to know to pass inspection and stay safe on the road.

FMCSA Lighting Requirements for Class 7 & 8 Trucks

The law says your truck must have certain lights and reflectors. These aren't optional. They're there for visibility and safety—yours and everyone else’s.

Where Your Lights and Reflectors Should Be

• Front: Amber clearance lights on the top corners. Headlights, turn signals, and marker lights.
• Sides: Amber marker lights near the front, red near the rear. Side reflectors too.
• Rear: Red tail lights, brake lights, and clearance lights. Also, reflectors and a license plate light.
• Top Rear (over 80 inches wide): Three red identification (ID) lights in the center.

Reflective Tape & Height Rules

• Use red and white reflective tape on the sides and rear of your trailer.
• Tape must be placed between 15 and 60 inches off the ground.
• Make sure it's clean and not peeling. Faded tape won't cut it at inspection time.

Prepping for Your Annual Inspection? Here's a Quick Checklist:

• All lights turn on properly (headlights, signals, brake lights, marker lights)
• Lenses are clean and not cracked
• Reflectors are visible and securely mounted
• Reflective tape is applied correctly and still sticks
• No exposed wires or corrosion
• All aftermarket lights are DOT or SAE approved

FINAL TIP: Always check the lens. If it doesn’t say DOT or SAE, don’t install it. It won’t pass inspection, and it could get you ticketed. Even worse, it could be too dim (or too bright) and create a safety hazard.

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Choosing Aftermarket Truck Lights That Fit

Want to upgrade your lighting? You can get pretty much any aftermarket light fixture you can think of at 4 State Trucks. 

Plug-and-Play vs Custom Wiring

• Plug-and-play (most products) is easy. Just connect it, and you’re good to go.
• Custom wiring takes more time but gives you more control—great for custom builds.

Know your skill level. Don’t fry your system trying to wire a $25 light.

Sealed & Waterproof? Always.

Your lights take a beating—rain, snow, salt, vibration. Choose sealed, weatherproof housings every time. Look for IP67 or IP68 ratings so you know they’re built to last.

Tips for Shopping for Aftermarket Lighting Upgrades

You can easily shop for a full aftermarket lighting upgrade for your rig, whether it’s replacing your headlights, interior cab lights, or adding more exterior marker lights to your truck, from the bumper, hood, and fender to the air-breather panels. Shop for your make/model to find the right fitment for your new lights.