Auxbeam Q40 H4 (9003) LED Fog Lights 120W 30,000LM — 6,500K Cool White, Plug-and-Play

Auxbeam Q40 Series H4 (9003) fog lights are compact, high‑output LED offroad lights that deliver a focused 6,500K white beam at 120W and up to 30,000 lumens for brighter, longer-lasting visibility.

Built to upgrade factory H4/9003 halogen fog or auxiliary lamps, the Q40 Series swaps bulky ballasts and fragile connectors for a single, solid metal unit. It uses a dense array of Z‑Knight chips, multi‑layer cooling, and built‑in decoding to improve light output and fitment compatibility while minimizing heat and electrical errors. These lights are intended for auxiliary, fog, or offroad use — not for DRL operation — and include a two‑year warranty.

How does the Q40 improve brightness and beam quality?

The Q40 uses 64 Z‑Knight LED chips with ultra‑tight 0.03‑inch spacing to create a concentrated, 6,500K white beam. That dense chip layout reduces dark spots and provides a clearer cut‑off line so light is directed where you need it without excessive scatter.

• 120W combined power producing up to 30,000 lumens per pair
• 6,500K cool white temperature for high contrast at night
• 360° chip arrangement for even coverage, no shadows
• Engineered cut‑off line to avoid blinding oncoming drivers

Will these fit my vehicle and how easy is installation?

Auxbeam designed the Q40 as a direct physical replacement for H4 (9003) bulbs, matching the filament and collar positions so they install like a factory lamp. The unit is all‑in‑one—no external ballast or fragile pigtail—so most installs take only a few minutes with standard H4 sockets.

• 1:1 interface and collar position for H4/9003 compatibility
• No external ballast or adapter required
• Plug‑and‑play fit for 99% of vehicle systems thanks to built‑in decoder chips
• Follow vehicle-specific notes: not compatible with DRL circuits

How is heat managed and how long will the Q40 last?

Thermal control is handled through multiple layers: a liquid‑cooling copper tube, a 15,000RPM turbo fan, pure copper baseplate, and aviation‑grade aluminum housing with cold‑shield fins. That engineering increases heat dissipation and supports a long service life under continuous use.

• 6‑layer cooling system with liquid copper tube and turbo fan
• Pure copper baseboard for fast thermal transfer
• Aviation aluminum housing and cold‑shield heat sinks
• Estimated service life up to 60,000 hours

Are there compatibility or warranty considerations I should know about?

The Q40 includes smart decoding chips to prevent most CAN‑bus errors and flicker issues, helping compatibility with a wide range of modern vehicles. Auxbeam provides a two‑year warranty and offers support if you run into installation or operation issues; however, these lights are not designed for DRL circuits.

• Built‑in decoding reduces error codes and flicker
• 99% vehicle compatibility expected; check photos for fitment notes
• Not intended for daytime running light circuits (DRL)
• Two‑year warranty with customer support for installation issues

Who is this product for? The Auxbeam Q40 Series H4 (9003) fog lights suit drivers, offroad enthusiasts, and tradespeople who want a substantial upgrade from halogen fog lamps to a compact, high‑output LED solution. Choose these if you need a direct‑fit H4 replacement with strong heat management, improved night visibility, and a built‑in decoder for broad vehicle compatibility. If you require DRL integration, consult fitment notes or your vehicle manual before purchasing.