SZHLUX 400W LED Grow Light 4×4 ft Full-Spectrum — Fanless 864-LED with Double Switches

SZHLUX 400W LED Grow Light is a full-spectrum, fanless fixture with 864 LEDs and dual switches designed to efficiently light a 4×4 ft grow area for seedlings, vegetative growth, and flowering.

If you need reliable indoor lighting that balances power and efficiency, the SZHLUX 400W delivers a sunlight-like spectrum, adjustable output and a quiet, low-heat design. Built with a trapezoid array of SanAn 1W LEDs, this lamp emphasizes even canopy coverage and energy savings while offering independent control for partial or full output. It’s engineered for hydroponic racks, tents and greenhouse supplemental lighting where consistent spectrum and low noise matter.

How does this grow light support different growth stages?

The SZHLUX provides a sunlight full spectrum that mixes white, blue, red and IR wavelengths to suit seedlings, vegetative growth and bloom phases. Independent double switches let you choose lower output for young plants or full output for flowering, so you tailor intensity without extra equipment.

• 3000K and 5000K whites for balanced vegetative development
• 660nm red and 730nm IR to support flowering and fuller canopy penetration
• Two switches for 3-light or 6-light zones to adjust PAR and photon flux

What area and light intensity can I expect from this fixture?

The fixture is optimized for an effective footprint of roughly 4×4 ft at typical hanging heights used in tents and small rooms. At 400W and 2.9 µmol/J efficiency, it delivers strong uniform canopy penetration suited to medium- to high-light crops when positioned and hung according to plant needs.

• Effective coverage: approximately 4×4 feet for most canopy stages
• High luminous density from 864 LEDs for even light distribution
• Improved reflector design reduces side light loss and boosts usable intensity

How does the design manage heat and noise in an indoor grow?

SZHLUX uses a fanless, aluminum-body design that conducts and radiates heat rather than relying on noisy fans. The solid heat dissipation shell and reflector layout minimize thermal stress on diodes and keep operation quiet — ideal for spaces where noise is a concern.

• Passive cooling with aluminum housing for stable, quiet operation
• Reflector reduces light spilled to aisles and walls, increasing canopy intensity
• Lower ambient noise compared with fan-cooled fixtures

What energy savings and controls does the fixture offer?

With an efficiency of 2.9 µmol/J and 400W draw from 864 LEDs, this light reduces power usage compared with many traditional quantum boards or HPS setups. Dual-switch zoning gives you simple, reliable control over brightness without additional dimmers or timers.

• Energy-efficient LED array for lower electricity consumption
• Dual-switch design for partial or full output selections
• Simple plug-and-play setup—no extra drivers or controllers required

Who is this for? Growers who need a quiet, energy-conscious LED for a 4×4 ft area will find SZHLUX’s 400W fixture well suited to seedlings through bloom stages. It fits hobbyists and small commercial growers using tents, shelves or greenhouse benches who want full-spectrum performance, even light coverage and easy two-step intensity control without added fans or complex control systems.