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Black Dog PhytoMAX-4 4S 250 Watt LED Grow Light


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Black Dog PhytoMAX-4 4S 250 Watt LED Full Spectrum Grow Light


Using just 250 watts the PhytoMAX-4 4S delivers 531 μmol/s of light for smaller grow areas.

It comes in two options based on which power cord you need. The SP model contains an IEC power cord, which is not a water tight connection. The SC model contains a locking, water-tight power cord that is optimal for greenhouses and wet spaces. 

All Black Dog LED Grow Lights have free shipping to the contiguous U.S. and much of Canada! 

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 cannabinoid production.


Black Dog has been perfecting grow lights and supporting our customers since 2010- we're among the oldest LED grow light manufacturers still in existence.


Dimmable from 15% - 100% with industry-standard 0-10V dimming controllers.

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.

Designed and Assembled in Colorado:

We utilize only the highest-quality parts and have been perfecting the PhytoMAX design for over 8 years- these lights are built to last!

Hanging Hardware Included:

A pair of V-hooks and ratcheting rope hangers are included with every light.

Go BEYOND PAR with our Phyto-Genesis Spectrum®

Phyto-Genesis Spectrum

The Phyto-Genesis Spectrum has been finely-tuned to not just grow plants, but to grow more-compact, more-productive and higher-quality flowers, fruit and leaves. Unlike most LED grow lights that use white or white and red LEDs, we incorporate 8 different LED colors to target specific responses from the plants, known as photomorphogenesis.

Our spectrum triggers plants' hormonal response to different colors of light and the ratio of these colors to minimize stem growth while maximizing flower and fruit production. Compact, bushier plants are not only easier to work with but also maximize yield per square foot.


3% ultraviolet light (<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 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 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 light (600-700nm) drives photosynthesis, but can also cause plants to elongate their stems if not matched with an appropriate amount of blue light.


Photon Flux (μmol/s)
531 16 476 40

Dimming 0-10V, 15-100%
Dimensions 15" x 15" x 4.5"
Weight 24lb
Power 250 Watts
Certifications UL 1598, UL 8800, ETL, CE, FCC, RoHS
Mean Time Before Failure > 70,000 hours
Number of LEDs 112
Amp Draw 2.5 @ 100V
2.08 @ 120V
1.2 @ 208V
1.09 @ 230V
1.04 @ 240V
0.9 @ 277V (SC model only)
0.72 @ 347V (SX model only)
Included Power Cord Length 8 ft
Power Cord Options NEMA 5-15, NEMA 6-15, NEMA 7-15 (SC model only), Pigtails
AC Voltage Range SP Model: 100-250V (50 / 60 Hz)
SC Model: 100-277V (50 / 60 Hz)
SX Model (special order): 347V
Power Factor 0.99
Operation Ambient Temperature Range -4 to 104 °F
BTU 853
Fans Expected Life > 70,000 hours
Warranty 5 Years

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