Product Overview
If you want better light output without changing the classic look of your truck, this is the right kind of upgrade. The Holley RetroBright 4×6 series is built for old-school sealed beam systems, giving your Kenworth modern LED performance while keeping a period-correct appearance.
This makes it a strong fit for W900B and W900L owners who want cleaner nighttime visibility, lower power draw, and simple installation without turning the front end into a modern-looking retrofit.
Key Features & Benefits
Classic Sealed Beam Look
RetroBright headlights are designed to preserve the traditional 4×6 sealed beam appearance. That means you get a cleaner OEM-style look instead of an overly modern face on a classic truck.
Modern LED Performance
Hi/low beam versions are rated at:
- Low Beam: 2000 lumens
- High Beam: 3000 lumens
- Low Beam Candela: 18,000cd
- High Beam Candela: 37,000cd
That translates into a meaningful upgrade over stock halogen sealed beams, with better usable light and improved road visibility.
Plug-and-Play Revised Versions
The revised part numbers are a major advantage because they feature updated wiring for a plug-and-play application with no additional harness required in typical setups.
This is especially important for buyers who want a simpler install and less guesswork.
Choice of Output Color
Available in:
- Classic White (3000K): warmer, more vintage-style appearance
- Modern White (5700K): cleaner, brighter modern white output
This lets you tailor the look of your truck depending on whether you want a restoration-style finish or a more updated appearance.
Low Draw, Longer Life
Compared to halogen sealed beams, these LED headlights:
- use less power
- generate less heat
- offer a longer service life
That makes them a smart long-term upgrade for trucks that see real road time.
Durable Serviceable Design
- Cast aluminum housing for strength and heat management
- UV-treated polycarbonate lens for impact resistance
- Replaceable LED cartridges for easier serviceability
Color and Variant Options
This product family includes multiple options, including:
- Classic White 3000K hi/low beam
- Modern White 5700K hi/low beam
- Classic White high-beam-only
- Additional variants may be available depending on the listing setup
For trucks using separate high-beam-only positions, make sure you choose the correct configuration.
Performance / Compatibility / Use-Case
Designed for applications using 4×6 rectangular sealed beam headlights, including Kenworth W900B and W900L setups using those housings.
Compatible sealed beam replacement numbers include:
- H4651
- H4652
- H4656
- H4662
- H4666
- H4668
- H4739
- H5051
- H5062
- H6545
Best suited for:
- Kenworth W900B and W900L owners
- Classic truck upgrades
- Drivers replacing dim halogen sealed beams
- Builds that need period-correct style with modern lighting performance
Installation / Fitment / Technical Details
- 4×6 rectangular sealed beam replacement
- H4 connector
- 9–18V DC input
- LHD traffic pattern
- Sold individually
Important: Order quantity depends on your truck configuration. Hi/low beam and high-beam-only versions are different products and should be selected carefully based on your headlight arrangement.
Build Quality / Warranty
- DOT compliant
- Street legal
- Polycarbonate lens
- Cast aluminum housing
RetroBright headlights are built to give classic trucks a safer and more dependable lighting package without losing their character.
Warranty: 2-year manufacturer warranty.
What’s Included
- (1) RetroBright 4×6 LED headlight
Note: Sold individually. Order the quantity needed for your truck’s headlight layout.
Frequently Asked Questions
Will these headlights fit a Kenworth W900B or W900L?
Yes, these are designed for 4×6 rectangular sealed beam applications and are a strong fit for Kenworth W900B and W900L setups using that headlight size.
Are these plug-and-play?
The revised hi/low beam versions are designed as plug-and-play applications with updated wiring. Some older or non-standard applications may still need additional review depending on how the truck is wired.
What is the difference between Classic White and Modern White?
Classic White is a warmer 3000K color that better matches a vintage or period-correct look. Modern White is a 5700K output that looks cleaner, brighter, and more contemporary.
What is the difference between hi/low beam and high-beam-only versions?
Hi/low beam headlights handle both low and high beam functions in one unit. High-beam-only versions are intended for positions that are dedicated to high beam only, so buyers need to match the product to their truck’s headlight configuration.
Are these brighter than stock halogen sealed beams?
Yes. They provide a noticeable upgrade in output, beam control, and visibility compared to old sealed beam halogen headlights.
Do these still look stock?
They keep a classic sealed beam appearance, which is one of the biggest advantages of the RetroBright lineup. They look much more period-correct than many modern LED conversions.
Are these sold as a pair?
No. These headlights are sold individually, so you need to order the correct quantity for your truck.
What sealed beam numbers do these replace?
They replace several common 4×6 sealed beam sizes including H4651, H4652, H4656, H4662, H4666, H4668, H4739, H5051, H5062, and H6545.
