Upgrade Your Visibility with a Clean Modern Look
If you’re running older sealed beam headlights, you’re leaving performance on the table. This ULTRALIT 4×6 LED high beam delivers stronger light output, improved clarity, and a sharp white position light for a modernized appearance on your truck.
Key Features & Benefits
High Output LED Performance
Produces up to 1,600 lumens on high beam, giving you improved road visibility compared to traditional halogen headlights. LED technology offers better beam consistency and reduced eye strain during long hauls.
White LED Position Light
Integrated center LED bar with dual-function white lighting adds a clean, modern DRL-style look while improving visibility during daytime driving.
Direct 4×6 Sealed Beam Replacement
Designed to replace standard 4×6 headlights, making it a straightforward upgrade for trucks using sealed beam systems.
Built for Harsh Conditions
Constructed with a die-cast housing and durable polycarbonate lens to withstand vibration, weather, and road debris common in heavy-duty applications.
Dual Voltage Compatibility
Operates on both 12V and 24V systems, making it suitable for a wide range of semi trucks and heavy-duty vehicles.
Performance & Compatibility
- Headlight Size: 4″ x 6″
- Beam Type: High Beam
- Output: 1,600 lumens (high beam), 1,260 lumens reference
- Voltage: 12–24V
- Position Light Color: White
- Compliance: DOT/SAE, FMVSS 108
Common applications include:
- Peterbilt 379
- Other vehicles using standard 4×6 sealed beam headlights
Fitment varies by setup. Always confirm headlight size before ordering.
Installation & Technical Details
- Plug-and-play for main headlight connection
- Separate wiring required for white position light
- Fits into existing headlight housings
Professional installation recommended for proper aiming and wiring.
Built for the Long Haul
With an IP67-rated housing, this headlight is sealed against dust and water intrusion, ensuring durability in demanding trucking environments.
What’s Included
- (1) ULTRALIT 4×6 LED High Beam Headlight
- Integrated white position light
- OEM-style connector
Frequently Asked Questions About Peterbilt 379 4×6 LED Headlights
Are these headlights plug and play?
The main headlight plugs directly into your factory harness. The white position light requires additional wiring.
Will this fit my Peterbilt 379?
This headlight is designed for standard 4×6 sealed beam applications commonly used on Peterbilt 379 trucks.
Is this a high beam or low beam?
This is a high beam module only. A matching low beam is required for full headlight functionality.
What’s the difference between white and amber position lights?
White provides a cleaner, modern DRL-style look, while amber gives a more classic or show-truck appearance.
Are LED headlights better than halogen?
Yes, LED headlights offer improved brightness, better beam pattern, and longer lifespan compared to traditional halogen bulbs.
Are these waterproof?
Yes, the housing is IP67-rated, meaning it is protected against dust and water exposure under normal conditions.
Can these run on 24V systems?
Yes, they are designed for both 12V and 24V systems.
Do these meet DOT regulations?
Yes, they are listed as DOT/SAE compliant and meet FMVSS 108 standards.
