Best 400W LED Grow Light Review

So, when choosing a 400W grow light for your indoor cannabis garden, you have settled upon using an LED grow light. Generally, LEDs are very powerful, with the ability to produce excellent yields when used in the right way. A 400 Watt LED grow light unit can provide a footprint coverage of about 3ft by 3ft.

400W LED Grow Light

The range may be different depending on the growth phase. You have the option of increasing the coverage area by using more than one grow light. We have identified four of the best 400W grow lights that you can use in your cannabis garden.

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Our Top Picks Best 400W LED Grow Lights

ECRU LED Grow Light Twin Panel – 400W Equivalent Growing Lamp

ECRU LED Grow Light Twin Panel - 400W Equivalent Growing Lamp (2 Pack x 200W) with White, Blue and Red LED Diodes Light Bulb for Indoor Plant Seedling, Vegetation and Flowering

Grow lamp that you should highly consider when choosing an LED lamp for your indoor farm is the ECRU LED Grow Light Twin Panel 400W Equivalent Growing Lamp. It is highly efficient due to its superior LED chips.

The chips have diodes that are larger and brighter than that of the standard LED chip. The PAR and lumen value of the grow light is, therefore, 20 percent more than that of regular LEDs. The light can readily replace a traditional 150Watt HPS/MH lamp while using a power of only 27 watts.

It, therefore, helps you save plenty of energy. The light panel contains 48 LEDs that consist of red, blue, and magenta lights. The LEDs produce a sun-like spectrum that is perfect for use throughout all the growth stages of your plants. The light spectrum contains cool white, red, blue, and UV lights.

The lights help your plants grow and develop through the seedling, vegetative, flowering, and harvesting stage. It removes the need for switching the grow light through the different stages. They are especially beneficial when growing your clones without the need of changing lights.

The lamp has an arm that can rotate to 180 degrees. After you install the lamp above your plants, you can turn it to a manner that can give your plants adequate light.

Pros 

  • The grow light is lightweight and very easy to install as it comes with various installation methods and a guide to help you set it up.
  • You can use the light throughout all the stages of growth without the need to change it
  • It provides a full spectrum light with a warm and cool white light that closely resembles the sun
  • It has two LED panels that provide a greater light coverage for your plants
  • It is highly efficient and energy saving
  • The light ensures that your harvest is of high yields
  • You can use it to grow various types of plants
  • It has a flexible arm that allows you to install the light in different positions

Cons 

  • The grow light is too bright to look at with bare eyes.

California Light Works SolarXtreme 400 LED Grow Light Fixture

California Light Works SolarXtreme 500 LED Grow Light Fixture - Full Spectrum 400w Watt COB Lighting System - 120V Volt - Lightworks

One of the top quality LED lights you can use in your grow farm are those that use COB chips. And one that will never fail you is the California Light Works SolarXtreme 500 LED Grow Light Fixture. It should be the first choice for any cannabis grower that only wants to get the best yields without messing around.

The grow light contains 8 COBs, each using 50 watts to produce a full spectrum light. It emits an intense white light that is effective for use in all the growth stages of your cannabis plants.

The grow light provides you with coverage of 5ft by 5ft during the vegetative period and 4ft by 4ft during the flowering phase. The grow light features two huge fans and a large heat sink that helps to reduce the heat produced by the COB LEDs.

Pros 

  • The lamp produces a full spectrum light that facilitates the growth of your plants through all the stages of growth
  • It is energy efficient and at a lower cost than that from regular LED grow lights.
  • The grow light can provide coverage of 4ft by 4ft.
  • The lamp is easy to install and start using.
  • The grow lamp comes with a one year warranty

Cons 

  • The grow light produces a lot of heat, necessitating you to have an effective ventilation system in your grow tent.

MARS HYDRO 400W LED Grow Light; Full Spectrum Grow Lamp

MarsHydro LED Grow Light 300W Full Spectrum for Hydroponic Indoor Plants Growing Veg and Flower Daisy Chain ECO 300W

Everyone wants to get the best results from their cannabis plants, a bountiful harvest. To achieve it, you need to provide your plants with a top-quality light spectrum. Few grow lights can compete with the MARS HYDRO 400W LED Grow Light when it comes to producing a high quality light.

The lamp gives a red and blue spectrum light that is of top quality at a low operating cost. It makes use of Epistar chips together with its improved reflector cup design to provide a 100 percent output. The chips have a parallel connection that ensures the failure of one chip does not affect the whole light.

The light penetrates deep into your plant’s canopy. The lamp produces a similar output to a 250-watt HPS/MH grow lamp providing coverage of 3.5 ft by 3.5 ft during the vegetative stage and 2ft by 2 ft for the flowering phase. It comes with aluminum heat sinks and two fans that help to reduce the excess heat produced by the light.

Pros 

  • The grow light provides your plants with a full spectrum light
  • The lamp has a long lifespan of 50,000 hours
  • It comes with a veg and flowering switch to help switch the light according to the growing phase
  • It has an inbuilt cooling system that helps to reduce the heat production

Cons 

  • The light is too bright for the eyes.

Hipargero 400W COB LED Grow Lights Fixture Full Spectrum

hipargero LED Grow Light - 1200W COB LED Grow Lights Full Spectrum with UV IR 3000K COBs 3W Osram Chips for Indoor Plants Veg Flower Lighting

LED lights are one of the costly grow lights you can purchase today. However, the Hipargero 400W COB LED Grow Lights Fixture is one of the cost-effective lights providing top quality light for your plants.

The grow light produces a full spectrum light ranging from 380nm to 730nm consisting of red and blue LEDs. The lamp uses top quality Osram LEDs and High Power Epileds COBs that do not burn out like other LEDs that do not last for long. The grow light can readily replace a 300-watt HPS/MH grow light when using a power of only 120 watts.

The lamp can provide your plants with a covering of 2ft by 2 ft when you place it 18 inches above the plants. When you have a small indoors garden, two of this light fixture are enough to provide your plants with the right amount of light to grow effectively.

It has an inbuilt cooling system consisting of powerful high-speed fans and a built-in aluminum heat sink. It also has an aircraft-grade iron shell that helps transfer heat from the LEDs to the outside of the lamp. By doing so, it helps to extend the service of the grow light by a few more months. You cannot use this lamp outdoors or in a humid environment since it is not waterproof. It comes with a one year warranty as well as a 30-day money-back guarantee.

Pros 

  • The lamp provides a full spectrum light to your plants with a higher PPFD than other grow lights.
  • It is energy-saving and more effective than other similar grow lights.
  • It provides coverage that is better than that of a reflector series
  • The grow light has a powerful cooling system that helps to get rid of heat and extend the life of the LED bulbs.
  • You can use it through all the growth stages without switching it out with another light
  • It has a long lifespan of about 50,000 hours
  • The lamp is simple to install and use

Cons 

  • The grow light is not waterproof
  • It is incredibly bright and may burn your eyes when you look at it directly

Summing up

One of the factors that you need to consider when choosing a grow light to use should be the wattage of the unit. Your grow light wattage will determine the size of your coverage area and how the light will affect the various cannabis grow stages.

A 400w grow light is highly efficient and does not consume a lot of power. It provides a sizeable coverage that you can increase by using more than one grow light in your grow tent. When growing cannabis, you need to get a lamp that will provide you with a full spectrum light.

It reduces the need for using more than one light in your grow room, saving you unnecessary costs. The light as well needs to be the right spectrum for each growth stage if you want to get the best yields.

Without meeting the precise requirements for your cannabis farm, you are setting up your plants to experience failure. We hope that the above 400W LED grow lights will make your job of choosing the right grow lamp for your farm.

Bestseller No. 1
BLOOM PLUS LED Grow Light BP 4000W 5x5ft Coverage Sunlike Full Spectrum LED Grow Light Use with 1292packs Samsung Diodes(Includes IR) Dimmable Plant Grow Lamp for Indoor Plants
3,508 Reviews on Amazon
BLOOM PLUS LED Grow Light BP 4000W 5x5ft Coverage Sunlike Full Spectrum LED Grow Light Use with 1292packs Samsung Diodes(Includes IR) Dimmable Plant Grow Lamp for Indoor Plants
  • LOWER COSTS & HIGHER-QUALITY YIELDS---Using the Newest high-yield LED technology-1292 pcs Samsung 2835 diodes. So BP4000 LED Grow Lights achieves a high energy efficiency of 2.7 umol/J and improves the light transmittance. The LED Growing Light consumes only 400W of power, which is 50% less than the operating power of other 800W HID/Blurple/HPS lamps, while help gets 50% higher yield harvest. The maximum output is 2.5g/w. Veg Coverage: 6 x 6 ft, Flower: 5 x 5 ft.
  • OPTIMAL FULL-SPECTRUM LIGHTING---The Full Spectrum led grow lamp can provide everything the plants need under light at all stages. The powerful blue light makes the plants grow faster, and IR light is particularly useful during flowering, it can accelerate bloom time and increase yield, fill the flowers with space and obtain an amazing harvest. This can not only reduce buds but also increase yield while saving energy and costs.
  • UNIQUE DESIGN---Plant Grow Lights have a dimmable driver on the back, you can remove the rubber plug and adjust it with a 3mm Phillips screwdriver (adjustment range: 1.5-3.0A). Designed for indoor growers, the full spectrum LED grow lights aim to help individual indoor growers and greenhouse growers to obtain higher yield and better quality within the budget.
  • UNIQUE DESIGN---Plant Grow Lights have a dimmable driver on the back, you can remove the rubber plug and adjust it with a 3mm Phillips screwdriver (adjustment range: 1.5-3.0A). Designed for indoor growers, the BP4000 full spectrum LED grow lights aim to help individual indoor growers and greenhouse growers to obtain higher yield and better quality within the budget.
  • 100% SATISFACTION GUARANTEED---The Bloom Plus LED series offers a 30-day money-back guarantee and a trusted 3 years warranty. Professional U.S. local after-sales service provides you with the most convenient shopping experience. If any questions, please feel free to contact us with email.
Bestseller No. 2
Yuanhui YH400B Led Grow Light, 400w 4x4ft 1536pcs Samsung lm301b Full Spectrum Plant Growing Lamp, Dimmable Commercial Grow Light Bar for Indoor Plant, Veg Bloom 2.8umol/J Daisy Chain, Foldable
16 Reviews on Amazon
Yuanhui YH400B Led Grow Light, 400w 4x4ft 1536pcs Samsung lm301b Full Spectrum Plant Growing Lamp, Dimmable Commercial Grow Light Bar for Indoor Plant, Veg Bloom 2.8umol/J Daisy Chain, Foldable
  • 【Ideal for All Growth Stages of Plants】The full spectrum plant lights provide 3000K warm light color, 5000K daylight color, and 660nm increasing deep red color, which can make the light more uniform, truly simulate the sunlight, and perfectly meet the entire growth cycle of all plants from seed to harvest, including Medicinal plants, flowers, vegetables, etc.
  • 【2022 Latest Energy Efficient Design 】The led grow light equipped with energy-efficient Samsung lm301b diodes, the number of light-emitting diodes is more than similar competing products, and the Low energy consumption, more power-saving, a total of 1536pcs diodes, including 960pcs Samsung lm301b 3000K, 480pcs Samsung lm301b 5000k and 96pcs red 660nm, HIGH PPFD, reach up to 2.8umol/J
  • 【Full Spectrum Dimmable Design】 The plant light is equipped with knob dimming and RJ14 dimming, brightness is adjustable from 0% to 100%, daisy-chain up to 100 units, can be easily meet the plant development process, including germination, nutrition, flowering, and fruiting.
  • 【Wide Area Coverage】The plant growing lamp Applicable to 4x4ft for flowering, 4.5x4.5 ft for veg and seeding. can be easily satisfied with personal or commercial indoor planting
  • 【High-Quality Quiet Portable Design】The grow light bar is foldable for easy placement and portable installation, and the adjustable adapter has an RJ14 interface, which can control multiple plant lights in series, which is convenient for you to plant in a large area. The plant light adopts full 6063 aluminum oxide heat sink, which dissipates heat quickly and has no noise. We are the source manufacturer, guarantee product quality, provide 30-day free return and exchange, 3-year warranty service.
Bestseller No. 3
iPower GLSETX400DHMWING20 Horticulture 400 Watt HPS MH Digital Dimmable Ballast Grow Light System Kits Wing Reflector Hood Set, 400W
1,006 Reviews on Amazon
iPower GLSETX400DHMWING20 Horticulture 400 Watt HPS MH Digital Dimmable Ballast Grow Light System Kits Wing Reflector Hood Set, 400W
  • 400W Digital Dimmable Electronic Ballast: Support 120V/240V Input; Dimmable Options: 50%, 75%, 100%; 8 Feet heavy-duty power cord included; Stable power output ensure flicker free light
  • 1 x 400W Super HPS bulb 2100K; 1 x 400W MH bulb 6000K; optimized Spectrum and high PAR (photosynthetic active radiation) to promote healthy plant growth and soonest flourish
  • 1 x pair of 8-ft adjustable ratchet clip hanger rope: hold up to 150 lbs
  • 19-inch Wing Reflector: up to 4' x 4' light coverage; Built-in 15 feet heavy duty lamp cord with E39 Ceramic Mogul Socket and standard Hydroponic S-Plug; highly 95% reflective textured German aluminum maximizes the light reflected to the plants
  • This system will generate too much heat to be used in an enclosed area without ventilation. Adequate ventilation is required for all iPower grow light systems. We recommend the use of an iPower inline fan
Bestseller No. 4
BLOOM PLUS Latest XP4000 LED Grow Light with Samsung LM301B Diodes 400W Upgraded Dimmable 5x5 ft Coverage Full Spectrum Plant Grow Light for Indoor Plants Seeding Veg Bloom Hydroponic Growing Lamps
222 Reviews on Amazon
BLOOM PLUS Latest XP4000 LED Grow Light with Samsung LM301B Diodes 400W Upgraded Dimmable 5x5 ft Coverage Full Spectrum Plant Grow Light for Indoor Plants Seeding Veg Bloom Hydroponic Growing Lamps
  • TOP PERFORMANCE & HIGH EFFICACY: Bloom Plus upgraded XP4000 LED growing light use the latest high-efficiency (2.7 umol/J) LED plant light technology - Samsung LM301B Diodes for extremely high output, increase the yield of crops and save operation cost, generates more usable lighting per watt, and provides better light canopy penetration.
  • LESS ENERGY CONSUMPTION: Comparable to traditional 800W HPS/MH, XP4000 Plant Grow Lamp consumes only 400Watt with 832 pcs LEDs! Get 50% higher yield harvest and save costs. Perfect for core coverage 5x5 ft. Adjust the height and brightness properly to meet your plants desired level for optimal growth.
  • ADVANCED FULL SPECTURM & DIMMABLE KNOB: Delivering optimal light-spectrum coverage - 650-665nm Red Lights ,2800-3200K warm lights, 4800-5000K white lights ,730-740nm IR lights, best for all stages growing from seed to flower, increase yield & crop quality‎. XP4000 LED indoor growing lamp has a dimming knob that makes it adjustable to different growing periods for your plants; It can adapt to the growth needs of different plants in different periods.
  • SILENT OPERATION & SOLID CONSTRUCTION: Fanless LED grow design will make your growing life quiet. Large areas of solid aluminum heat sinks help you to achieve the ideal cooling system. Adopts high performance power supply driver to achieve high PAR output, longer lifespan to speed up plant's grow processes and boost yields while saving you on your energy bill.
  • 100% SATISFACTION GUARANTEED---The Bloom Plus LED Grow Lights offers a 30-day money-back guarantee and a trusted 3 years warranty. Professional U.S. local after-sales service provides you with the most convenient shopping experience. Make sure you purchase authentic Bloom Plus grow lights. If any questions, please feel free to contact us by email.
Bestseller No. 5
2022 New SONLIPO SPF4000 LED Grow Light 400W 5x5ft Coverage, Use 1323pcs Samsung Diodes Sunlike Full Spectrum Veg Bloom Switch Growing Lamps for Indoor Plants Seeding Flower Led Plant Light Fixture
29 Reviews on Amazon
2022 New SONLIPO SPF4000 LED Grow Light 400W 5x5ft Coverage, Use 1323pcs Samsung Diodes Sunlike Full Spectrum Veg Bloom Switch Growing Lamps for Indoor Plants Seeding Flower Led Plant Light Fixture
  • 【Lower Running Costs & Higher PPFD】Actual power only 400 watts, High PPFD, up to 1784 ¦Ìmol/m2.s. Comparable to a traditional 900W HPS or CMH light. Save up to 60% on your electricity bill. Using 1323pcs of the latest high quality LED technology - Samsung LM281+ diodes, to provide high PAR output, longer lifetime and better light canopy penetration. SPF4000 grow light perfect for 5x5ft vegetable stage, 4x4ft bloom stage.
  • 【VEG & Double BLOOM Switch】Aaccording to the growth and yield of plants, SONLIPO designed 3 switches, VEG, BLOOM and enhance BLOOM, to facilitate the control of red and blue light spectrum, to make the roots and stalks of plants grow thicker, and prevent them from growing taller in vain. Enhance RED light, can greatly increases the size and number of flowers to maximize the yield of the plant, maximum 2.9 g/w.
  • 【Full Spectrum Grow Light】Infinitely close to natural sunlight, consists of 660nm Red light, IR 740nm, and 3000K, 4000K, 5000K, 6000K light spectrum. IR is dimmer than other red diodes. 3000K providing more reddish light and the 6000K providing more blueish. The 660nm red and IR light is especially useful during bloom, where it speeds up flowering time and boost yields. Uniformly across the surface and deep into the roots and bottom of canopy for consistent, highest quality flowers.
  • 【Well Made, Excellent Heat Dissipation】Solid structure, No Fan Noise Free. The housing is made of aviation heat sink aluminum, thick and strong, and provides excellent heat dissipation. Cable has protective cover, user-friendly packaging. Built-in short-circuit protection device automatically protects your lights from damage, you can easily save money without purchasing lights frequently.
  • 【100% Warranty & Easy to use】Plug and Play, One-touch switch sets the light spectrum for your plant to suit it. Product quality and friendly customer service are always our primary objectives. We offer a 90-day new replacement or full refund, 12 months free warranty, and professional guidance to help your horticultural grow and grow craft better.
5/5 - (4 votes)

Bowden draws from over a decade of home growing experience as well as consulting for small-scale and hobbyist-level growers. He has written hundreds of articles, thought pieces, and tutorials about growing cannabis at home

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