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HLG 350 Diablo LED grow light, full spectrum quantum board, white frame.
White HLG 350 Diablo LED grow light with full-spectrum LEDs, suspended by wires.
HLG 350 Diablo quantum board LED grow light with full spectrum diodes and white frame.
Horticulture Lighting Group HLG 350 Diablo full-spectrum LED grow light with white frame and numerous LEDs.
HLG 350 Diablo LED grow light, full spectrum quantum board, white frame.
White HLG 350 Diablo LED grow light with full-spectrum LEDs, suspended by wires.
HLG 350 Diablo quantum board LED grow light with full spectrum diodes and white frame.
Horticulture Lighting Group HLG 350 Diablo full-spectrum LED grow light with white frame and numerous LEDs.

HLG 350 Diablo Full Spectrum LED Grow Light

Reduced Price:
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Or
Pay as little as
$41175/mo
for a term that suits you, up to 36 months. Learn More
⚡ HOLIDAY SALE 25% Off HLG Ends: December 31st
❗ NO CODE NEEDED

🍃 Earn 412 points for shopping and get $4.11 off your next order. Join Harvest Club for free

To calculate 10 percent of a number, simply divide it by 10 or move the decimal point one place to the left. For example, 10 percent of 230 is 230 divided by 10, or 23.
pricePoints: 411.75
411.75,0
1
percentage: $4.11
rt:

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MODEL: HLG350D
Order today, ships between December 31 - January 15, 2026
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About HLG 350 Diablo Full Spectrum LED Grow Light

Full Spectrum

Type

330W

Power

3' x 5'

Coverage

5 Years

Warranty

HLG 350 Diablo Full Spectrum LED Grow Light

Tired of the high heat and energy bills from your old 600-watt HPS lights? The HLG 350 Diablo is the ultimate upgrade, delivering superior performance with just 330 watts. It's a powerful replacement for a 600W HID, setting a new standard for modern LED grow lights.

Each HLG 350 Diablo is built with two advanced Diablo Quantum Boards® from Horticulture Lighting Group, featuring high-efficiency Samsung full-spectrum white and deep red LEDs. This combination produces a powerful, sun-like light that fuels vigorous growth from seed to harvest. With integrated reflectors, this fixture ensures deep canopy penetration, leading to higher-quality yields and denser buds throughout your grow space.

Features

💡
Superior Efficiency

Replaces a 600W HPS light using only 330W, drastically cutting energy costs.

🌿
Full-Cycle Spectrum

Samsung white and deep red LEDs provide the perfect spectrum for both veg and flower.

💥
High-Intensity Output

Delivers over 950 PPF for intense light that drives exceptional plant growth.

↔️
Even Canopy Coverage

A 35" wide design with integrated reflectors ensures uniform light distribution.

❄️
Passive Cooled Design

Silent, fanless operation provides reliability and reduces ambient heat.

🎛️
Fully Dimmable

Adjust intensity from 0 to 330 watts to match your plants' needs at any stage.

🌍
Universal Voltage

Auto-sensing power supply works on 120V, 240V, and 277V circuits.

🛡️
5-Year Warranty

Backed by HLG's comprehensive warranty for complete peace of mind.

Spectrum Analysis

Horticulture Lighting Group HLG 350 Diablo Spectrum Analysis Chart

Specifications

Specification Value
Power 0-330W
Voltage Range 120-277 VAC, 50-60Hz
LEDs Full Spectrum White & Deep Red
Flowering Footprint 3' x 5' @ 15"
Veg Footprint 5' x 5' @ 24"
System PPF Efficacy 2.80 μmol/joule
Total Output (PPF) 950+ PPF
Dimensions 35" x 9.5" x 3.25"
Weight 10 lbs
Mounting Height 15" - 24" above canopy
Certifications UL 8800, CSA, DLC

Support & Manuals

Warranty

The HLG 350 Diablo is covered by a 5-year manufacturer's warranty. This warranty does not cover user error or operator abuse.

FAQs

What is the main advantage of the HLG 350 Diablo over a traditional 600W HPS light?+

The HLG 350 Diablo offers three key advantages: superior energy efficiency (using almost 50% less power), a significant reduction in heat output (making climate control easier), and a full, optimized spectrum that promotes healthier plant growth and higher-quality yields compared to the limited spectrum of HPS bulbs.

What are the ideal coverage areas for this light?+

For flowering, the HLG 350 Diablo effectively covers a 3' x 5' area. For vegetative growth, it can cover a larger 5' x 5' footprint. The recommended mounting height is 15-24 inches above the plant canopy.

What makes HLG's Quantum Board technology special?+

Quantum Boards are large circuit boards with many small, highly efficient LEDs spread across them. This design allows for a more even light distribution, better heat dissipation (enabling the fanless design), and superior efficiency (PPF/W) compared to traditional COB or single-diode fixtures. To learn more about what makes this technology a game-changer, check out our guide on how HLG sets the bar for Quantum Board grow lights.

Is this light dimmable?+

Yes, the HLG 350 Diablo features a built-in dimmer that allows you to adjust the power output from 0 to 330 watts. This gives you precise control over light intensity, which is ideal for different growth stages from seedlings to late flower.

What other lights does HLG offer for different-sized spaces?+

The HLG 350 Diablo is perfect for its specified coverage area. For larger spaces, you might consider the more powerful HLG 750 Diablo for a significant boost in output, or the bar-style HLG Scorpion Diablo for maximum canopy coverage in a 5'x5' tent.

Shipping & Returns

Order Processing & Shipping

We currently ship within the United States only. No international shipping is available at this time.

Order Processing:

  • Most orders are processed within 24-48 hours after being placed.
  • Some products may have extended processing times of 7-14 business days or more, which will be clearly indicated on the product page. If your order includes such items, you will receive an email from our team or be contacted directly to confirm the estimated shipping timeframe.

Shipping Times:

We partner with reliable national carriers to deliver your orders. While specific delivery times can vary, here's a general timeframe for each carrier:

  • USPS: Typically delivers between 9:00 AM and 5:00 PM, Monday through Saturday.
  • FedEx: Typically delivers between 8:00 AM and 8:00 PM, Monday through Friday, with some Saturday deliveries.
  • UPS: Typically delivers between 9:00 AM and 7:00 PM, Monday through Friday, with some Saturday deliveries.

Note:

  • These are estimated delivery hours and may vary depending on your location and specific delivery circumstances.
  • For the most accurate delivery information, please refer to the tracking details provided once your order has shipped.

Free Shipping

Free shipping on qualified items to the lower 48 states. Some that are not eligible are stated on their respective product information page. Learn more

Refunds & Returns

Cancellations are accepted within 24 hours of placing an order.
Returns are subject to each manufacturer's return policy. Please look into the return policy of the brand prior to ordering. Learn more

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