Dual Beam LED Upgrade in One Headlight
If you’re replacing old sealed beam headlights, this ULTRALIT 4″x6″ LED unit simplifies your setup by combining both high and low beam into one housing. No need to mix and match beam-specific units—this is a complete upgrade in a single headlight.
Perfect for older trucks and classic builds running H4651 or H4656 setups.
High & Low Beam Function in One Unit
Designed for full functionality without separate housings.
- Dual-function high and low beam
- Simplifies installation and wiring
- Ideal for standard 4″x6″ headlight systems
Replaces common sealed beam types including H4651 and H4656.
LED Performance Upgrade
Built with high-power LED output for improved visibility.
- 5 high-intensity LEDs
- Consistent light output
- Designed for improved clarity over halogen
Reinforced Reflector Design
Engineered to maximize light output and distribution.
- Reinforced aluminum reflector
- Helps improve beam spread and efficiency
- Designed for better road visibility
Built for Heavy-Duty Use
Designed to handle real-world trucking conditions.
- Rugged anti-vibration construction
- Solid-state LED design
- Built for long-term durability
Plug-and-Play Installation
Designed for easy replacement of sealed beam headlights.
- Fits standard 4″x6″ headlight housings
- Direct replacement for H4651 / H4656
- Connects to existing wiring
Note: Installation may vary depending on vehicle setup.
Compliance & Fitment
- Standard 4″x6″ headlight size
- Dual beam (high + low) in one unit
- DOT / SAE compliant (FMVSS 108)
What’s Included
- (1) ULTRALIT 4″x6″ LED Headlight (High & Low Beam Combined)
Frequently Asked Questions About 4×6 LED Headlights
Does this headlight replace both high and low beam?
Yes. This unit combines both high and low beam functions into one headlight, eliminating the need for separate units.
What does it replace?
It replaces standard sealed beam headlights such as H4651 and H4656.
What vehicles use 4″x6″ headlights?
4″x6″ headlights are commonly found on older semi-trucks, including Kenworth W900, T800, and Peterbilt 379 models.
Are these brighter than halogen sealed beams?
Yes. LED headlights provide more consistent light output and improved clarity compared to traditional halogen sealed beams.
Are these plug-and-play?
They are designed to connect to your existing wiring harness for straightforward installation.
Do I need separate high and low beam units?
No. This headlight includes both high and low beam functionality in one housing.
Are these good for fleet vehicles?
Yes. The durable construction and simplified design make them ideal for fleet use.
Do these resist vibration and damage?
Yes. The solid-state design and rugged construction help resist shock and vibration.
How do these compare to separate beam LED headlights?
This offers a simpler setup, while separate beam units can sometimes provide more specialized performance depending on application.
