🔥 GreenThumbDepot Black Friday Sale Extravaganza is Live Now! Click Here to See What's On Offer 🔥
🔥 GreenThumbDepot Black Friday Sale Extravaganza is Live Now! Click Here to See What's On Offer 🔥
Skip to content
Spider Farmer® GlowR40 Deep Red Spectrum 660nm Supplemental LED Grow Light - Green Thumb Depot
Spider Farmer GlowR40 Deep Red Spectrum 660nm Supplemental 40 Watt LED Grow Light

Spider Farmer GlowR40 Deep Red Spectrum 660nm Supplemental 40 Watt LED Grow Light

See more by Spider Farmer
SKU: SF-GlowR40

Official Distributor

Save 18%
$114.00
$94.00
Preview Icon

An Important Note on Pricing and Returns:

We believe in upfront pricing and fair policies—no hidden fees, no surprises, and easy, transparent returns. If you're comparing options, we encourage you to review competitors’ fine print carefully.

We've helped countless customers who had issues elsewhere, and we’re here to make sure that never happens to you.

Or

Monthly payments start at:

$2.61/mo

Learn More

Check Icon

Monthly Payment Start at:

$2.61/mo

Learn More

Contact us about commercial pricing

Notify me when back in stock

Check Icon Order Processed in 12 hours
Check Icon Free Shipping Over $200 (Exclusive Apply)
Check Icon No Sales Tax! (Outside Nevada, on most products)

Free Shipping

On most orders

Call Us

(833) 416-0375

Mon-Fri 9am-6pm CST

Lowest Price Guranteed

There is never a better price,

we can always price match

No Sales Tax

Absolutely no tax on any purchase

Easy Returns

Always hassle free

Free Shipping

Lowest Price Gurantee

No Sales Tax

Easy Returns

Is the Spider Farmer® GlowR40 Deep Red Spectrum 660nm Supplemental LED Grow Light right for me?

If you're aiming to enhance your indoor garden's flowering and fruiting phases, the Spider Farmer® GlowR40 offers targeted deep red light (650-665nm) to boost photosynthesis and promote robust plant growth.

  • Features & Benefits
  • Product Specifications
  • What is included?
  • Warranty Policy

Spider Farmer® GlowR40 Deep Red Spectrum 660nm Supplemental LED Grow Light

The Spider Farmer® GlowR40 is an efficient supplemental lighting solution designed to enhance plant development during critical growth stages.

  • Emits deep red light (650-665nm) to enhance flowering and fruiting stages
  • IP65-rated waterproof design ensures durability in high-humidity environments
  • Daisy chain capability allows connection of up to 16 light bars at 110V
  • Multiple installation methods: bottom, side, under-lighting, and top lighting
  • Digital programmable timer for customized lighting schedules

Why does the Spider Farmer® GlowR40 Deep Red Spectrum 660nm Supplemental LED Grow Light stand out?

The Spider Farmer® GlowR40 distinguishes itself with its targeted deep red spectrum, enhancing photosynthesis during critical growth stages. Its robust, waterproof construction and versatile installation options make it a reliable choice for indoor gardeners seeking to optimize plant development.

Why Spider Farmer?

Spider Farmer is renowned for its innovative LED grow lights, developed by a passionate team of horticulturists and engineers. They prioritize sustainability and efficiency, offering high-quality products that transform traditional plant cultivation methods.

Why Buy From Us?

At GreenThumbDepot, you're not just another sale to a faceless corporation. You're partnering with a team genuinely invested in your success. Our legendary customer service, combined with a promise of unbeatable prices, sets us apart. We're here for you, always.

FAQ Section

What is the power consumption of the Spider Farmer® GlowR40?
The GlowR40 consumes 40 watts in total, with each of its two light bars drawing 20 watts.
What spectrum of light does the GlowR40 emit?
The GlowR40 emits deep red light in the 650-665nm range, which is beneficial for flowering and fruiting stages of plant growth.
How many diodes are present in the GlowR40?
Each light bar of the GlowR40 contains 36 diodes, totaling 72 diodes across both bars.
Can multiple GlowR40 units be connected together?
Yes, the GlowR40 supports daisy-chaining, allowing up to 16 light bars to be connected in series at 110V, and up to 32 light bars at 220V.
Is the GlowR40 suitable for high-humidity environments?
Yes, the GlowR40 features an IP65-rated waterproof transparent lampshade, making it suitable for use in high-humidity environments.
What are the dimensions of each GlowR40 light bar?
Each light bar measures approximately 2.06 feet in length, 0.15 feet in width, and 0.12 feet in height.
Does the GlowR40 come with a programmable timer?
Yes, the GlowR40 includes a digital programmable timer, allowing users to customize lighting schedules based on plant growth stages and specific requirements.

Specifications

Spider Farmer® GlowR40 Deep Red Spectrum 660nm Supplemental LED Grow Light Specifications
Light Spectrum 650-665nm Deep Red
Weight 1.5 lbs (0.68 kg)
Voltage AC100-277V
Power 40W (20W per light bar; 2 bars included)
Dimensions 2.06 ft x 0.15 ft x 0.12 ft (per light bar)
Diode Quantity 72 LEDs (36 per light bar)
Waterproof Rating IP65
Daisy Chain Capability Up to 16 bars at 110V; up to 32 bars at 220V

What’s in the Box?

The Spider Farmer® GlowR40 Deep Red Spectrum 660nm Supplemental LED Grow Light package includes:

  • 2 x GlowR40 Light Bars
  • 4 x Fixed Rod
  • 4 x Black Hanging Kits
  • 1 x Timer

Warranty Policy

Please check out the manufacturers website for Warranty related issues.

Is the Spider Farmer GlowR40 Deep Red 660nm Supplemental LED Grow Light Right for Me?

The Spider Farmer GlowR40 is engineered for growers who want to boost flowering intensity, resin production, and overall bloom performance. Using a powerful 660nm deep-red spectrum, this 40W supplemental bar enhances Emerson Effect activity and supports robust reproductive growth. Ideal for tents, racks, and commercial arrays, the GlowR40 integrates easily with any main grow light to deliver stronger, fuller flowering results.

Features & Benefits

Specifications

What is included?

Warranty & Returns

Features

Maximize your Plant Growth

The Spider Farmer GlowR40 delivers targeted 660nm deep-red wavelengths to supercharge flowering performance in any grow setup. At just 40 watts, it delivers high-efficiency output, passive cooling, and wide coverage—perfect for tents, racks, or vertical systems. Whether you're enhancing bud development, density, or bloom initiation, the GlowR40 provides a powerful and cost-effective upgrade to any lighting system.

660nm Deep-Red Bloom Spectrum

Ideal for Flowering Supplementation

Enhances Emerson Effect Stimulation

40W Low-Energy Performance

Durable Aluminum Build

High Output — 660nm Targeted Boost

Benefits of LED Grow Lights

LED grow lights offer numerous benefits for plant cultivation. They are energy-efficient, customizable in spectrum, emit minimal heat, and have a long lifespan. These qualities reduce costs, enhance growth, and promote environmentally friendly and low-maintenance cultivation practices.

Instant On/Off

It allows precise control over light cycles.

Full Spectrum Lighting

This promotes healthier and more robust plant growth.

Low Heat Emission

This reduces the risk of heat stress and saves them from damaging

Easy Installation

LED grow lights require less maintenance, saving you time and effort.

Optimized Light Output

Allows you to adjust the light spectrum to suit different plant types and growth stages

Power Saver

LED grow lights save energy, costs, and promote sustainable cultivation.

Durable Design

Constructed with top-quality materials, ensuring prolonged use in various conditions.

Consistent Output

Engineered for sustained performance, guaranteeing optimal light output over time.

wetanddry

Why Spider Farmer?

Spider Farmer is trusted by growers worldwide for delivering reliable, high-efficiency LED grow lights at an exceptional value. Their fixtures use premium Samsung LEDs, advanced drivers, and rugged construction designed to perform for years. With smart controls, strong warranties, and proven grow results, Spider Farmer provides professional-grade lighting at accessible prices, making it a top choice for home and commercial cultivators.

wetanddry

Spectrum Matters

The Spider Farmer GlowR40 delivers a narrow 660nm deep-red spectrum specifically tuned for flowering enhancement. This wavelength intensifies bloom initiation, promotes fuller floral development, and supports the Emerson Effect when paired with full-spectrum LEDs. Ideal as a bloom booster, the GlowR40 provides targeted light energy that complements any primary fixture for more vigorous, high-quality flower production.

Targeted 660nm Red Spectrum

Designed to enhance flowering intensity, bloom initiation, and overall reproductive growth with concentrated deep-red output.

Enhances Full-Spectrum Fixtures

Perfect supplement to white-light LEDs, increasing spectral richness and supporting the Emerson Effect for accelerated bloom activity.

High Efficiency, Low Heat

Efficient 40W design outputs strong red intensity without raising canopy temperatures or increasing power consumption significantly.

Why Thousands of Growers Choose to Work Exclusively with Greenhouse with plants

Green Thumb Depot Logo

Them Green Thumb Depot Logo

icons-no Support
icons-no Nearly impossible to reach a real person. Endless chatbot loops, auto-replies, and unreturned emails.
icons-no Real humans. We answer quickly. Always here, always helpful
icons-no Order Processing
icons-no Orders often sit for days before being acknowledged. No clear confirmation, updates, or timelines.
icons-no Orders are processed immediately. You'll receive confirmation, tracking, and real-time updates within hours.
icons-no Shipping
icons-no Slow, vague, and unoptimized. Basic carriers, minimal tracking, and delayed delivery windows.
icons-no Fast, insured, and fully trackable shipping — optimized for speed and visibility every step of the way.
icons-no Pricing
icons-no Hidden fees, bait and switch tactics, post purchase price increases.
icons-no Our relationships guarantee the lowest prices. Transparent and fair. No surprises at checkout, and no shady tactics after the sale.
icons-no Returns & Warranty
icons-no Hidden fees, bait and switch tactics, post purchase price increases.
icons-no Clear, honest, and fast. Our return policy is built to protect your investment, not dodge responsibility.
icons-no Support
icons-no Frustrating automated responses
icons-no Fast, helpful and always supportive
icons-no Order Processing
icons-no Delays and lack of communication
icons-no Instant processing and updates
icons-no Shipping
icons-no Slow, unreliable and delayed service
icons-no Fast, insured, trackable shipping
icons-no Pricing
icons-no Deceptive pricing practices
icons-no Lowest prices, no surprises
icons-no Return & Warranty
icons-no Frustrating, misleading return policies
icons-no Clear, honest return policy

FAQ Section

What spectrum does the GlowR40 emit?
The GlowR40 emits a concentrated 660nm deep-red spectrum, ideal for enhancing flowering performance and promoting stronger bloom development.
Can the GlowR40 be used with any grow light brand?
Yes, it is fully compatible with all LED grow lights, HPS systems, and commercial lighting arrays as a supplemental bloom booster.
What is the ideal mounting height for the GlowR40?
For flowering, the recommended mounting height is 12–18 inches above the canopy, depending on plant response and intensity needs.
Can this supplemental bar replace a full grow light?
No, the GlowR40 is designed as a bloom supplement. It enhances flowering but should be used alongside a full-spectrum main grow light.
Is the GlowR40 waterproof?
Yes, it is IP65 rated, making it suitable for humid grow environments and commercial cultivation spaces.
How long is the expected lifespan of the GlowR40?
The GlowR40 has a lifespan of over 50,000 hours, ensuring long-term reliable performance.
Does it generate a lot of heat?
No, the GlowR40 uses passive cooling and runs cool enough for close placement without overheating your canopy.
Is the GlowR40 dimmable?
No, the GlowR40 operates at a fixed output optimized for deep-red flowering enhancement.
What voltage range does the GlowR40 support?
It supports a wide input range of AC 100–240V, suitable for residential and commercial setups.

Specifications

SPECS & DIMENSIONS

Weight 1.76 lbs (0.8 kg)
Dimension 34.6" × 2.3" × 1.3"
LED Light Spectrum 660nm Deep-Red

MATERIALS & POWER

Voltage and Current

  • AC 100–240V input range for universal compatibility.

LED Diodes

  • High-efficiency deep-red 660nm diodes for bloom enhancement.

Power Supply

  • Quality internal driver ensures stable and efficient output.

LED Lights

Dimmability

  • Non-dimmable; optimized for consistent 660nm bloom performance.
Brand Spider Farmer
SKU GlowR40
Wattage 40W
Power Consumption ≈ 40W ± 5%
Spectrum 660nm Deep-Red
Fixture Type LED Bar (Supplemental)
Coverage Area 2' × 4' (Supplemental)
Water Resistance IP65 Rated

What is Included?

What’s in the box.

  • GlowR40 660nm Supplemental LED Bar
  • Mounting Clips & Hardware
  • Power Cord
  • Daisy Chain Cable
  • User Manual

Warranty Policy

It's recommended to contact Spider Farmer for specific warranty information related to their LED grow lights. Please note that warranty details may vary depending on the product model, purchase location, and other factors.

>