Z-OFFROAD 4x6 LED Headlight Assemblies Sealed-Beam Hi/Lo - 4PCS Chrome, DOT Approved, 6500K

Z-OFFROAD 4x6 DOT Approved LED headlight assemblies are a sealed-beam, hi/low replacement set engineered to fit classic 4x6 headlamp openings and deliver a brighter, more focused white beam.

These chrome 4-piece headlight assemblies replace legacy halogen and HID xenon sealed beams (H4651, H4652, H4656, H4666, H6545 and equivalents) and are built to DOT/SAE standards for on-road use in the U.S. and Canada. Each lamp uses modern LED chips with a cool 6500K color temperature and a projector-style lens to extend beam distance while preserving a controlled cutoff that reduces glare for oncoming drivers.

What vehicles and standard bulbs do these replace?

This kit is designed for any vehicle with a 4x6" rectangular headlight opening and common sealed-beam footprint. It directly swaps into housings that accept H4651 / H4652 / H4656 / H4666 / H6545 style lamps, making it suitable for many trucks, heavy rigs and older passenger models.

• Fits KW models: T800, T600, T400, W900 series
• Compatible with Peterbilt 357, 378, 379 and many Freightliner models
• Also fits various Chevy/GMC trucks, Camaro RS, Blazer, Suburban and other 4x6 setups
• Replaces xenon/HID and halogen sealed beams with the listed H-numbers

How bright and what beam patterns do the LEDs produce?

The LEDs deliver up to four times the perceived brightness of traditional halogen sealed beams, rated around a 6500K cool white. They offer separate low- and high-beam operation: low uses two lamps, high activates all four, with a projector lens that sharpens range without creating blind spots.

• Approximate output: 108W per mode per pair, ~5200 lm per pair
• 6500K cool white output for crisp visibility
• Projector lens with a defined "Z" shaped cutoff to limit glare
• Distinct low- and high-beam behavior for legal, safe use

Are these durable and weatherproof for heavy-duty use?

Yes — each lamp is built with a sealed aluminum housing and shatter-resistant polycarbonate lens to withstand harsh road conditions. The assemblies are IP67 rated and include breather valves to reduce fogging and prevent moisture intrusion for long-term reliability.

• Heavy-duty aluminum body for heat dissipation and strength
• UV-protected shatterproof PC lens resists yellowing
• IP67 waterproofing and 8 breather valves to prevent condensation
• Estimated life over 50,000 hours with anti-flicker circuitry

How easy is installation and what does the kit include?

Installation is straightforward for anyone familiar with sealed-beam swaps: the kit ships with the lamps, H4 connectors and the hardware needed to match vehicle polarity. No complex wiring or external ballasts are required; simply align the pins to your vehicle's headlight connector and secure the housings.

• Included: 2 high-beam lights, 2 low-beam lights, 4 H4 connectors
• Comes with installation instructions and accessory fittings
• Direct 12V DC operation — no separate drivers required
• Polarity-adjustable pin arrangement for easy swap-in

Who is this for? Installers, fleet operators, truck drivers and owners of older cars or commercial rigs who want a DOT-approved LED upgrade for existing 4x6 sealed-beam housings will appreciate the balance of brightness, rugged construction and legal beam pattern. If you need a plug-and-play LED solution that improves night visibility while maintaining an approved cutoff and long service life, this Z-OFFROAD 4x6 chrome set is purpose-built for that use.