Black Dog PhytoMAX-4 20SC 1250 Watt LED Grow Light — Green Thumb Depot
Skip to content
Black Dog PhytoMAX-4 20SC 1250 Watt LED Grow Light

Black Dog PhytoMAX-4 20SC 1250 Watt LED Grow Light

  • Unlock $140 rebate after purchase when you buy through us!
  • Ships in 1-5 days at most

Notify me when back in stock

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

The PhytoMAX-4 lights by Black Dog are engineered to deliver unparalleled yield and quality in plant cultivation. Instead of focusing solely on maximizing photons per watt, these lights prioritize achieving the highest yield per watt while enhancing terpene, pigment, and cannabinoid production. With a legacy dating back to 2010, Black Dog stands as one of the oldest LED grow light manufacturers, demonstrating extensive experience and commitment to supporting customers. The lights are dimmable from 15% to 100%, providing flexibility with industry-standard 0-10V dimming controllers. Active cooling technology ensures efficiency and maximizes LED lifespan, particularly for the specialized UV and violet LEDs. Designed and assembled in Colorado with over 8 years of refinement, PhytoMAX lights are built to last, and each unit includes hanging hardware for ease of installation. With a proven track record, Black Dog offers unparalleled customer support, drawing on their firsthand experience in growing thousands of plant varieties with their lights.

Hey! Theres a $140 Rebate on This Product! $140 Cash Back When You Purchase with Us!

We've partnered with Black Dog Led to help growers just like yourself. When you purchase with GreenThumbDepot you can unlock a $140 rebate after purchase. Contact us one you've confirmed your purchase to learn how!

Is the Black Dog Led PhytoMAX-4 20S LED Grow Light Light Right for Me?

PhytoMAX-4 is engineered for peak efficiency and LED longevity through active cooling, crucial for specialty UV and violet LEDs. With an impeccable track record spanning 13 years and tens of thousands of lights, fan failures are non-existent. The patented design incorporates redundant fans, ensuring uninterrupted operation even if one fails.

Features & Benefits


What is included?

Warranty & Returns


Maximize Growth, Minimize Energy

PhytoMAX-4 is the ultimate grow light system, renowned for its active LED cooling that boosts efficiency and longevity, particularly for UV and violet LEDs. Over 13 years, thousands of lights have showcased fan reliability, complemented by redundant fan features. It offers a spectrum tailored for all growth stages and energy efficiency. Whether you're a hobbyist or commercial grower, PhytoMAX-4 guarantees thriving, sustainable cultivation.


Large flowering footprint


Powerful spectrum

Unparalleled Yield and Quality

Active Cooling

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.


Why Black Dog Led

Black Dog LED is a trusted choice for indoor growers due to its numerous advantages. Their LED grow lights offer a full spectrum, including UV and IR, promoting optimal plant growth and increased yields while being energy-efficient. These lights are durable, incorporating advanced technology like dimming capabilities, and often have a large coverage area, making them suitable for various scales of cultivation. With a proven track record of consistent performance, Black Dog LEDs are favored by growers seeking reliability and quality results.


Spectrum Matters

The Phyto-Genesis Spectrum is meticulously designed to foster compact, high-quality plant growth, emphasizing flowers, fruits, and leaves. Utilizing 8 distinct LED colors, it harnesses photomorphogenesis, triggering plants' hormonal responses to minimize stem growth and enhance flower and fruit production. This results in more efficient space utilization and increased yields.

Ultraviolet: 3% ultraviolet light (greater than 400nm) mimics the sun's natural UV light, keeping plants bushier and more compact, more resistant to pathogens and insects, and producing more terpenes and pigments. Unlike supplemental UV light bars, PhytoMAX-4 evenly distributes UV light across the entire growing area, and at a concentration that gives your plants the benefits of ultraviolet throughout the entire growing cycle, not just restricted to the last couple weeks of flower.

Infrared / Far Red: Infrared / far red light (700-750nm) increases photosynthetic efficiency through the Emerson Effect. Too much can cause stem elongation but when paired with the right ratio of red and blue light as in the Phyto-Genesis Spectrum, it increases yields.

Violet: Violet light (400-450nm) better penetrates dense plant canopies to nourish lower leaves, allowing high-quality flowers and fruit to grow lower on the plant.

Blue: Blue light (450-480nm) triggers chlorophyll B photosynthesis more efficiently than green or yellow light, and helps keep leaves more compact for better canopy penetration.

Red: Red light (600-700nm) drives photosynthesis, but can also cause plants to elongate their stems if not matched with an appropriate amount of blue light.

SP versus SC Models

The only difference between the SP and SC models is the power cord and the voltage it can handle.


SP model IEC power cord

Rated for 100-250 Volts
Not recommended for greenhouse use


SC model locking, water-tight power cord

Rated for 100-277 Volts
Locking, water-tight connection

Unparalleled Yield and Quality

PhytoMAX-4 lights are designed to grow the highest-quality and highest-quantity harvests. Rather than striving for the highest-possible photons per watt, PhytoMAX-4 is designed to give the highest yield per watt while maximizing terpenes, pigments and cannibinoid production.

Active Cooling

PhytoMAX-4 increases efficiency and maximizes lifespan by actively cooling the LEDs. Cooler LEDs run more efficiently and have a longer lifespan, especially for the specialty UV and violet LEDs we use. While fans are a moving part, we've never had one fail in tens of thousands of lights over the past 13 years, plus our patented design includes multiple redundant fans. Even if one were to fail, your light will keep running just fine.

Energy Efficiency

Energy efficiency is vital for sustainable growing. The lights minimize energy use without sacrificing performance. Reduced heat output means lower cooling costs, creating a comfortable environment for plants and savings for growers.

FAQ Section

What makes the PhytoMAX-4 20S LED Grow Light unique compared to other grow lights on the market?
The PhytoMAX-4 20S stands out due to its focus on achieving the highest yield per watt while maximizing terpenes, pigments, and cannabinoid production. This design philosophy sets it apart in the market.
How does the dimming feature work on the PhytoMAX-4 20S, and what are the recommended dimming controllers compatible with this LED grow light?
The PhytoMAX-4 20S is dimmable from 15% to 100% using industry-standard 0-10V dimming controllers, providing growers with flexibility in controlling light intensity throughout the plant growth cycle.
Can you provide details on the active cooling system of the PhytoMAX-4 20S and how it contributes to the efficiency and lifespan of the LEDs, particularly the UV and violet LEDs?
The active cooling system of the PhytoMAX-4 20S actively cools the LEDs, enhancing efficiency and extending their lifespan. Cooler LEDs, especially UV and violet ones, run more efficiently and have a longer lifespan. The system includes redundant fans for added reliability.
What is the spectrum range of the PhytoMAX-4 20S LED Grow Light, and how does it optimize terpene, pigment, and cannabinoid production in plants?
While the specific spectrum details may vary, the PhytoMAX-4 20S is designed to optimize terpene, pigment, and cannabinoid production, promoting robust plant growth and high-quality yields.
What is included in the hanging hardware that comes with the PhytoMAX-4 20S, and how easy is it to install for growers of different experience levels?
The PhytoMAX-4 20S includes a pair of V-hooks and ratcheting rope hangers for hanging. The setup process is designed to be user-friendly, accommodating growers of various experience levels.
How does the PhytoMAX-4 20S cater to the needs of different-sized operations, from small-scale cultivation to larger commercial setups?
The PhytoMAX-4 20S strikes a balance between size, throughput, and cost, making it suitable for both small to medium-sized operations and larger commercial setups, offering flexibility for growers with varying needs.
Are there any specific maintenance requirements for the PhytoMAX-4 20S?
Maintenance for the PhytoMAX-4 20S is straightforward, thanks to its stainless steel construction and an IP65 wash-down motor, allowing for easy cleaning.
Is there a warranty for this product?
Please check the warranty tab on this page for warranty information.
How long will shipping take?
Please check our shipping policy here for shipping information.
What is the return policy?
Please check our return policy here for return policy information.



Light Dimension 19" x 19" x 4.5"
LED Light Spectrum Full Spectrum
Warranty 5 Year


Voltage and Current

  • LED grow lights usually operate at standard household voltages (e.g., 120V or 240V) and draw current accordingly.

LED Diodes

  • High-quality LED diodes are at the core of LED grow lights.

Power Supply

  • LED grow lights come with power supplies or drivers that convert the incoming electrical voltage to the specific voltage required for the LED diodes to operate

Led Lights


  • Some LED grow lights offer dimming capabilities, allowing users to adjust the light intensity and power consumption to match the needs of their plants at different growth stages..
Brand Black Dog Led
Dimming 0-10V, 15-100%
Weight (lb.) 45
Length (in.) 19
Width (in.) 19
Height (in.) 4.5
LED Light Spectrum Full Spectrum
Power Factor 2656 μmol/s
LED Features Dimmable *with Controller, Supplemental UV
PAR Efficiency 2.12 μmol/J
Exact Watts 1250 Watts
Coverage Area Veg: 10' x 10'; Flower: 8' x 8'
Power Factor 0.99
Voltage 100-250V
Amps 12.5 @ 100V, 10.42 @ 120V, 6.01 @ 208V, 5.43 @ 230V, 5.21 @ 240V, 4.51 @ 277V (SC model only), 3.6 @ 347V (SX model only)
Frequency 50/60 Hz
Power Cord Length 8 ft.
SC Model 100-277V (50 / 60 Hz)
ETL Listed Yes
Warranty 5 Year
Number of LEDs 560
BTU 4263
Operation Ambient Temperature Range -4 to 104 °F

What is Included?

What’s in the box.

  • Black Dog PhytoMAX-4 20S LED grow light
  • A pair of V-hooks for hanging the light.
  • Ratcheting rope hangers for adjustable height and positioning.
  • Power cord and any necessary connectors.

Warranty Policy

It's recommended to contact Black Dog Led 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.