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HelioGrow™ 400W LED Grow Light – High-Output Full-Spectrum Lighting for Large Tents
HelioGrow™ 400W LED Grow Light – High-Output Full-Spectrum Lighting for Large Tents
HelioGrow™ 400W LED Grow Light – High-Output Full-Spectrum Lighting for Large Tents

HelioGrow™ 400W LED Grow Light – High-Output Full-Spectrum Lighting for Large Tents

HGC708929

Available on Amazon

For Growers Who Think Bigger

The HelioGrow™ 400W LED grow light delivers high-intensity, full-spectrum output designed for 4’ x 4’ grow tents and serious indoor cultivators. Built for uniform coverage, canopy penetration, and professional-grade performance.

If you’re searching for a high-output 400W LED grow light, this fixture provides strong PPFD levels across larger grow environments. Engineered for even distribution, it supports dense canopies and high-yield flowering cycles.

The HelioGrow™ 400W delivers optimized wavelengths for all growth stages—from early vegetative expansion to late-flower production. The balanced spectrum supports robust plant structure and improved flower development.

The advanced diode array ensures consistent light intensity across the grow space. Strong canopy penetration helps maximize lower bud sites and promotes even growth from top to bottom.

Whether running seedlings, autoflowers, or full photoperiod cycles, the dimmable driver allows you to tailor intensity to your environment. Reduce stress during early growth, increase power during peak flowering, and maintain optimal indoor control.

Getting Started with HelioGrow

Getting Started with HelioGrow

Unbox and Inspect

Carefully unpack your HelioGrow™ 400W LED and confirm all components: fixture, hanging kit, power cord, and end caps.
Inspect the corrosion-resistant lens and diodes to ensure everything is clean and intact before mounting.

Mount at the Right Height

For seedlings, position your light 18–24 inches above the canopy.
As plants mature, lower gradually to 12–16 inches.
Use the included adjustable hardware to fine-tune your distance for even PPFD coverage.

Set your Intensity

Begin at the lowest dimming level for seedlings and increase brightness every 10–14 days as growth accelerates.
Autoflowers thrive on consistency — the HelioGrow™ 200W four-step dimmer makes light transitions effortless and precise.

Dial in Your Cycle

Set your timer or RJ-12 controller to maintain an 18–20 hour light schedule.
Autoflowers don’t need darkness to flower, but a few hours of rest helps roots strengthen and plants reset.

Unbox and Inspect

Carefully unpack your HelioGrow™ 400W LED and confirm all components: fixture, hanging kit, power cord, and end caps.
Inspect the corrosion-resistant lens and diodes to ensure everything is clean and intact before mounting.

Mount at the Right Height

For seedlings, position your light 18–24 inches above the canopy.
As plants mature, lower gradually to 12–16 inches.
Use the included adjustable hardware to fine-tune your distance for even PPFD coverage.

Set your Intensity

Begin at the lowest dimming level for seedlings and increase brightness every 10–14 days as growth accelerates.
Autoflowers thrive on consistency — the HelioGrow™ 200W four-step dimmer makes light transitions effortless and precise.

Dial in Your Cycle

Set your timer or RJ-12 controller to maintain an 18–20 hour light schedule.
Autoflowers don’t need darkness to flower, but a few hours of rest helps roots strengthen and plants reset.

Download User Manual (PDF)
LED light fixture with text highlighting features on a black background
LED light fixture with text highlighting features on a black background

One Light. Multiple Applications.

Built for Every Stage of Indoor Growth

Autoflowers operate on a fixed genetic timeline, making consistency essential. HelioGrow provides stable intensity, balanced spectrum, and even canopy coverage to support steady growth from seed to harvest—without stressing fast-cycling plants.

View Autoflower Lighting Tips

From basil and cilantro to lettuces and microgreens, HelioGrow delivers bright, even light ideal for compact edible crops. Adjustable output allows you to maintain healthy growth year-round without overpowering sensitive plants.

See Indoor Herb Setups

Young plants require light that’s effective but controlled. HelioGrow’s dimmable output supports early root development and vegetative growth while reducing the risk of stress during propagation.

Learn About Propagation Lighting