Use Case: Small to medium growing areas

Area: smaller grow space 3.5’ x 3.5’ (1.07 meters x 1.07 meters)

Number of Plants: 1 large or 4 small to medium flowering cannabis plants

Desired Yield per Harvest per Fixture: 10 to 16 ounces (1 lb.)

Once you get into the 3 foot and larger grow spaces things start to get serious. To grow in these spaces you need to start to look at some real power. For a grow space from 3 to 3.5 feet in width a 400 watt light is required for flowering.

With a garden of this size and a 400 watt LED grow light should produce over a half pound with no problem on every harvest. With an experienced grower and good genetics hitting a pound with this amount of wattage and a high quality LED grow light a pound per harvest is within reach.

The best LED grow light for this size garden is the PhytoMAX 400. At 425 watts this light is capable of flowering a good size area with flower density that will rival anything you have used in the past. The size and weight of this light make it easy to handle even in a cramped garden space while minimizing cooling needs. Since the PhytoMAX 400 includes the proprietary Phyto-Genesis Spectrum you can be assured the quality of your plants will blow away even the most discerning of growers.

At 425 watts the PhytoMAX 400 is a replacement for a traditional 600 watt HPS bulb while being much easier to keep cool and work with. This light is perfect for a smaller tent such as a 3’ X 3’ and will satisfy any individuals’ needs for their own flower production. Truly full-spectrum with UV to IR, the PhytoMAX 400 uses only the highest-quality components and latest technology to deliver the best LED grow light in its size class!

The PhytoMAX 400 can server as the perfect light for a flowering space used in conjunction with a PhytoMAX 200 for a vegetative space. This type of pairing would allow you to have a quick turn and keep your flower area full and production at full capacity.

In flower the PhytoMAX 400 can handle a footprint of up to a 3.5’ X 3.5’ (42 inch X 42 inch) footprint and 5’ X 5’ (60 inch X 60 inch) for vegetative growth.

Key Features

  • 425 watts actual power draw
    • Other LED grow light manufacturers would call this a “910W” light based on the included diodes
  • True full-spectrum light from ultraviolet (UV) to infrared (IR) and everything in-between
  • Full, even footprint coverage without hot spots allows you to grow to the edge of the 3.5’ x 3.5’ flowering footprint
  • Highest-quality construction with heavy-duty commercial-grade components and a sturdy, all-metal housing
  • Extra-large heat sinks maximize heat dissipation
  • Active cooling provided by quiet fans rated for 70,000 hours of life
  • Limited lifetime warranty
  • Metal-geared 8 foot ratcheting light hangers included
  • Designed in the USA!



  • 182 high-power 5W diodes
  • 75” x 15.75” x 5”
  • 24 pounds
  • 5’ x 3.5’ flowering footprint
  • 5’ x 5’ veg footprint
  • Provides Black Dog LED’s exclusive Phyto-Genesis Spectrum® with 13 different LED colors, including UV and IR diodes
  • Compatible with almost all electrical systems, accepting 100-277 volts AC 50-60 Hz


One thought on “PhytoMAX 400 LED Grow Lights Review

  1. Evan Stoffberg says:

    I would like to know if you ship to South Africa or do you have a distributer in SA as I would like to purchase one of your LED lights.


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