4x6 Inch LED Headlights Rectangular Replacement H4651 H4656 - DOT

In this review of the 4x6 inch rectangular LED headlights from BICYACO, the bottom line is simple: these are a practical, road-legal upgrade for drivers who need brighter, dependable illumination without complex wiring. The reviewer found the plug-and-play fit and integrated anti-flicker circuitry to be the single biggest reason to buy, since they replace common H4651/H4656 style units and cut installation to about 20 minutes while avoiding flicker or CANbus errors on most vehicles.

Key Features

• DOT Approved: Legal for road use and designed to meet DOT and SAE standards so drivers can upgrade lights without compliance concerns.
• Plug and play installation: Comes with all required parts and H4 9003 HB2 wiring harnesses so most installations take about 20 minutes.
• High output LEDs: Delivers strong illumination with 3600Lm per piece on high beam and 2800Lm per piece on low beam for a wider, clearer field of view.
• Built for durability: IP67 waterproofing, shock proof design and a pure PC lens make these headlights resistant to scratches and road debris.
• Integrated anti-flicker: Anti-flicker circuitry on the board helps prevent flickering or warning lights on modern electrical systems.
• Improved cooling: Aluminum alloy housing and upgraded heat dissipation prolong LED life to an expected long lifespan.

Who It's For

This product is aimed at owners of older trucks and cars that use 4x6 in rectangular headlights, including many Kenworth and Peterbilt models and a wide range of light trucks and SUVs. It is well suited to drivers who want a straightforward upgrade from halogen or HID units to a bright, stable LED with minimal wiring changes.

Those who should look elsewhere include vehicles that do not use a 4x6 in rectangular headlight footprint or drivers seeking factory-matching cosmetic bezels and exact OEM styling; this is a functional lighting upgrade rather than a custom trim piece.

Pros & Cons

Pros

• DOT and SAE approved for legal road use while providing a sharp, controlled cut-off to avoid blinding other drivers.
• Plug-and-play fit with included harnesses reduces installation time to about 20 minutes for most vehicles.
• High lumen output produces noticeably brighter and wider illumination than typical halogen bulbs.
• Durable construction with IP67 waterproofing and a scratch-resistant PC lens for long-term use.

Cons

• Less suited to vehicles without the 4x6 in rectangular footprint or where OEM cosmetic matching is required.
• May require minor alignment adjustments on some vehicles to achieve the ideal beam pattern.

Specifications

Size	6.7 in length x 4.33 in width x 3.15 in depth
Power	60W per unit (real output)
Lumen output	3600Lm high / 2800Lm low per piece
Ingress protection	IP67 waterproof
Housing and lens	Aluminum alloy housing with pure PC lens
Compatibility	Replaces H4651 H4652 H4656 H4666 H6545; fits most 4x6 in headlight vehicles
Warranty	30-day money-back and 1 year warranty

Our Verdict

These 4x6 in rectangular LED headlights offer strong value for drivers who need a bright, durable and legally approved lighting upgrade. The combination of plug-and-play installation, integrated anti-flicker circuitry and high lumen output makes them a smart replacement for worn halogen or older HID units on compatible vehicles.

Frequently Asked Questions

Will these fit my truck or car?
They are designed to replace common 4x6 in rectangular headlights (H4651/H4656 family) and fit a wide range of vehicles, including many Kenworth and Peterbilt models; check your existing lamp footprint to confirm fit.

Are they legal for road use?
Yes, the lights are DOT and SAE approved for legal on-road use.

What comes in the package?
The package includes four 4x6 in 60W LED headlights and four H4 9003 HB2 wiring harnesses plus necessary parts for installation.