Product Overview
If you want better nighttime visibility without changing the old-school look of your truck, RetroBright 4×6 LED headlights are a strong solution. They keep the period-correct sealed beam appearance while delivering modern LED performance, longer service life, and lower power draw than traditional halogen sealed beams.
This is the kind of upgrade that makes sense on a Peterbilt 359—classic styling on the outside, modern lighting technology underneath.
Key Features & Benefits
Period-Correct Appearance for Classic Builds
These headlights are designed to preserve the vintage sealed beam look that fits classic Peterbilt trucks and other older applications. They do not have the overly modern appearance that can look out of place on a restoration or old-school build.
Better Visibility Than Traditional Halogens
For the hi/low beam versions, output is rated at:
- Low Beam: 2000 lumens
- High Beam: 3000 lumens
- Candela: 18,000cd low / 37,000cd high
That makes them a major upgrade over tired sealed beam halogens while still keeping a proper road-friendly beam pattern.
Plug-and-Play Installation
Updated plug-and-play versions are designed to connect to the factory headlight harness with no additional harness required in many applications. They use an H4 connector and are built to simplify installation on standard 4×6 sealed beam setups. Some older switched-ground applications may still require an adapter harness.
Designed for Shallow Headlight Buckets
One of the biggest advantages of the RetroBright platform is fitment in shallow buckets. These headlights are engineered for many classic vehicles and trucks where space behind the housing can be limited.
Serviceable LED Cartridge Design
Unlike many sealed replacement headlights, RetroBright units use replaceable LED cartridges for easier long-term serviceability.
Lower Draw, Less Heat, Longer Life
Compared to traditional halogen sealed beams, these LED headlights offer:
- Lower current draw
- Reduced heat output
- Longer service life
- More stable output over time
Classic White vs Modern White
Classic White (3000K)
A warmer output that better matches the vintage look of older trucks and restorations.
Modern White (5700K)
A cleaner, brighter white appearance for drivers who want a more updated look while still keeping sealed beam styling.
Hi/Lo Beam and High-Beam-Only Options
This product family includes more than one configuration depending on the SKU selected:
- Hi/Low Beam versions for standard low/high beam use
- High-beam-only versions for applications that require a dedicated high beam lamp
Be sure to choose the correct version for your headlight layout.
Performance / Compatibility / Use-Case
Designed for 4×6 rectangular sealed beam applications and commonly cross-references these trade numbers:
- H4651
- H4652
- H4656
- H4662
- H4666
- H4668
- H4739
- H5051
- H5062
- H6545
This makes them a strong fit for Peterbilt 359 applications that use 4×6 rectangular sealed beam headlights, along with many other classic truck and vehicle setups.
Installation / Fitment / Technical Details
For hi/low beam variants:
- Input Voltage: 9–18V DC
- Power: 25W low / 30W high
- Connector: H4
- Lens Material: Polycarbonate
- Housing Material: Cast aluminum
- Traffic Pattern: LHD drive only
- DOT Compliant: Yes
- Street Legal: Yes
For high-beam-only versions:
- Output: 3000 lumens high beam
- Candela: 37,000cd high
- Beam Type: High beam only
Build Quality / Warranty
These headlights are built with a UV-treated polycarbonate lens and cast aluminum construction for durability. The lens is designed to be stronger and more impact resistant than traditional glass sealed beams.
Warranty: 2-year manufacturer warranty.
What’s Included
- (1) 4×6 RetroBright LED headlight
- Integrated LED system
- Mounting hardware on select versions
Important: Many versions are sold individually.
Typical quantity needed:
- 2 units for dual headlight setups
- 4 units for quad headlight setups
Frequently Asked Questions
Will these fit my Peterbilt 359?
These are designed for vehicles using 4×6 rectangular sealed beam headlights. If your Peterbilt 359 uses that headlight size and matching layout, this is the correct style of upgrade.
Are these plug and play?
Yes, the revised plug-and-play versions are designed to connect to the factory harness for straightforward installation in many applications. Some switched-ground vehicles may still require an adapter.
What sealed beam numbers do these replace?
These replace common 4×6 sealed beam numbers including H4651, H4652, H4656, H4662, H4666, H4668, H4739, H5051, H5062, and H6545.
What is the difference between Classic White and Modern White?
Classic White is a warmer 3000K output for a more vintage look. Modern White is a 5700K output for a cleaner, brighter appearance.
Are there high-beam-only versions?
Yes. This product family includes both hi/low beam and high-beam-only versions, so it is important to select the correct lamp for your truck’s headlight configuration.
Are these brighter than standard sealed beam halogens?
Yes. The hi/low beam versions are rated at 2000 lumens on low beam and 3000 lumens on high beam, giving a substantial upgrade over traditional halogen sealed beams.
Are these road legal?
Yes, the standard versions are listed as DOT compliant and street legal for appropriate applications.
How many do I need for my truck?
That depends on your headlight setup. Many applications require either 2 or 4 lamps. Check your current layout before ordering.
