Best LED Grow Light For 4X4 Grow Tents – Full 2019 Review

The best LED grow light for your 4×4 grow tent should be powerful enough to meet the needs of your marijuana plants. This is dependent on several factors like whether your grow light’s coverage area is enough to cover a 4 foot width, and whether its PPFD intensity is high enough.

Need a grow tent? You can’t go wrong with a Vivosun 4×4 grow tent, and you can read my review for it here if you’re interested.

I always say when you’re picking a grow light, you really do get what you pay for in terms of spectrum and light intensity – the two most critical factors. That’s why I’m not recommending any cheap $100 lights in this article. You just won’t get that from them unless you buy 4 of each.

I recommend using a minimum 900 watt led grow light for your 4×4 grow tent.

How do I arrive at that number? My article about the minimum required PPFD is a good explainer. My recommendations are based on which lights emit the minimum amount of light needed by your plants in one light cycle (18hr during vegetative and 12hr during flowering).

Sure, people have grown marijuana plants using 400 or 600 watt lights. But their cannabis plants end up with one big flower on top and nothing worth its weight on the sides or bottom. The Best LED grow light for 4×4 grow tents is 900 watts and above, in my opinion.

best grow light 4x4 grow tent

A top heavy plant with no flowers on the sides, like the one above, is not an efficient use of time or money. You’ll be missing out on 30% of your harvest. Stick with 900 watts and above.

This article has two tables that I made for your convenience. The one just below are the grow lights I recommend to get the job done. But I put another table at the bottom of the article with a ton of the most popular grow light models, and I list how many you’d need of each model to sufficiently light up your 4×4 grow tent. The second table should help in case you already own other grow lights, or if you’re curious about a different model compared to the ones I recommended.

The number I suggest for any given grow light is based not on the manufacturer’s claimed coverage, but based on the coverage range where the light’s PPFD is still strong enough to give your plant maximum yield.  Enjoy!

The Best LED Grow Lights for 4×4 Grow Tents:

ModelFeaturesCheck Price Below (via Amazon)

Mars Hydro 1200w CREE

  • Strongest Light Intensity of the Whole List
  • Will grow maximum yield vs. cheaper lower intensity lights
  • Two Light Switches for Veg & Bloom
  • Perfect Spectrum

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Viparspectra PAR1200

  • Unique Design
  • Perfect Fit for 4X4 Grow Tent
  • PAR Balancing.
  • Only need 1 in a 4×4 tent

Check Price

Mars Hydro 900w

  • Top Rated Brand
  • 4X4 Grow Tent Compatible
  • 1267 uMol @ 18″ Height.
  • Only need 1 in a 4×4 tent

Check Price

BloomBeast A900

  • Modern Tech
  • Suits well to 4X4 Grow Space
  • Best Quality Spectrum.
  • Only need 1 in a 4×4 tent

Check Price

Mars Hydro 1200w CREE LED Grow Light – Best Option for 4×4 Grow Tent

best led grow lights

This is Mars Hydro’s best LED grow light, in my opinion. The reason is the top shelf CREE LEDs used in this light, which will emit the most powerful light onto your plants, period. Bridgelux and Epistar LEDs are great, but even comparing them to the CREE LEDs used in this light will show a stark difference.

Why is the Mars Hydro 1200w CREE LED Grow Light the best grow light for a 4×4 grow tent?

The Mars Hydro 1200w CREE is the best option because of the incredible PPFD intensity released by these LEDs. Combine that with the balanced red & blue light spectrum and you have a winner. Those are the two most important factors as mentioned earlier, and this light gets a 10/10 for both.

Check out the insane PPFD readings:

Mars Hydro 1200w CREE ppfd

At the 4.5’x4.5′ edge of coverage, you’re getting 700-1100 uMol of light, which will get you a maximum yield based on the 925 uMol recommended during a 12 hour bloom phase light cycle. Inside that 4.5’x4.5′ range you’re getting even more intensity.

This intensity could be too strong for a plant in vegetative phase, which is why the light allows you to switch on only blue spectrum for the vegetative growth phase. But during flowering your plants will want all that intensity so you’ll have both spectrum switches turned on for full power.

Will the Mars Hydro 1200w CREE get too hot for a 4×4 grow tent?

The light comes with four cooling fans and a heat sink to keep your tent cool. Mars Hydro says the operating temperature is between 65-105 Fahrenheit, which is normal for an LED grow light.

I’ve spent time reading through owner reviews for this light on different sites. Nobody has complained about heat, and in fact a couple have even said it runs cool, and runs cooler than a comparable HID light.

What Else You Should Know About The Mars Hydro 1200 watt CREE LED Grow Light In Your 4×4 Grow Tent:

I’ll go through the rest of the specifications below. First, know that I’ve looked at dozens of LED grow lights in my research time, and if you need a light for your 4×4 grow tent and you have a flexible budget, you can stop right here at the Mars Hydro 1200w CREE. This is the only light you’ll need. Other lights offering this level of quality are priced even higher.

Now for the other specifications:

2.0 g/watt
Power Draw:

Pros and Cons of Mars Hydro 1200w CREE LED Grow Light:

  • Built using highly reliable materials
  • Strongest PPFD numbers of this review.
  • Will grow max yield in a 4×4 tent vs. mediocre yield for cheaper lights
  • Two separate controller for VEG/BLOOM brightness level
  • 4 great cooling fans
  • Can be controlled using timer
  • Worry free customer oriented warranty
  • Price reflects the high quality – not for tight budgets

Click Here to see the Mars Hydro 1200 watt CREE LED Grow Light on

Viparspectra PAR 1200W LED Grow Light

best led grow lights

You may have heard the name Viparspectra. It’s one of the top selling LED grow light brands among indoor cultivators.

Viparspectra is a top selling brand because they offer low prices and solid value. With time, their product quality has evolved and today they’re producing a well refined LED grow light.

Why is the Viparspectra PAR1200 one of the best LED grow lights for 4×4 grow tents?

The Viparspectra PAR 1200w LED grow light is one of the best grow lights for your 4×4 grow tent because of its coverage capabilities. Check out the image below to get a more accurate idea.

You only need one of these lights to cover a complete 4×4 grow space. The strong PPFD reading of 958 at 28 inches combined with the reflective mylar inside your tent should be plenty to keep your plants growing abnormally large.

At 27 pounds most grow tents should be able to hang your Viparspectra PAR1200 without a problem. The Viparspectra PAR1200 comes with proper hanging equipment as well.

Control plant height in your 4×4 grow tent – Viparspectra PAR 1200w helps you do it with ease:

You don’t want your cannabis plants growing too tall when you’re in the confined space of your 4×4 grow tent. The most helpful tips are maintaining a steady temperature for shorter stems, and knowing when to switch from vegetation to flowering cycle. The Viparspectra PAR1200 has veg/bloom dimming knobs to make the switch easy. You should switch to flowering when your plant is half the desired height, as it’ll continue growing in flowering phase. Cut light exposure from 18 to 12 hours per day to begin flowering.

best led grow lights


Will the Viparspectra PAR1200 get too hot for a 4×4 grow tent?

According to verified owners the Viparspectra PAR1200 does not have heat issues. Believe it or not, many growers are still using or transitioning from HPS grow lights that get considerably hot in grow tents, and thus expect LED lights to be the same. Quality LED grow lights, including the Viparspectra PAR1200w are perfect for use in grow tents.

Don’t take it from me, or even Viparspectra. Buyers have mentioned it being comparable to their two 150w lights. Others have noted the fans are so quiet they had to make sure they were on. One person said it almost makes no heat at all following prolonged use. The Viparspectra PAR1200 is equipped with 5 x 3.2in cooling fans, along with a large aluminum heat sink.

What Else You Should Know About Viparspectra PAR1200 LED Grow Light In Your 4×4 Grow Tent:

The Viparspectra 1200W LED grow light is equipped with 238 High quality LED chips at 5W each. It’s supported by zener diode integration which prevents failure of the entire panel in case any single diode does out.

best led grow lights

This grow light only consumes 545 watts from your outlet at full operation. You simply cannot get this low level of consumption or heat output from a 1200w HPS light.

This LED grow light comes with a generous 3 year warranty and 30 day money-back guarantee.

In our opinion the Viparspectra PAR1200 LED grow light is the best all around LED grow light for 4×4 grow tents. All the features and capabilities come together to make a 4×4 growing experience easy and stress free.

Feel free to take a gander at other Viparspectra models as well, but the PAR series is much more advanced compared to Viparspectra Reflector Series.

Click here to see reviews and prices for the Viparspectra PAR1200 on

Pros and Cons of Viparspectra PAR1200 LED Grow Light

  • Built using highly reliable materials
  • Features full spectrum light with IR
  • Top notch PPFD numbers
  • Fits perfectly in a 4X4 grow tent
  • Highly intense light when placed in perfectly reflective grow tent
  • Two separate controller for VEG/BLOOM brightness level
  • 5 great of cooling fans
  • Can be controlled using timer
  • Reported better yields by users
  • Worry free customer oriented warranty
  • Don’t feature daisy chaining ability
  • Light is too bright and can’t look at it directly (Needs safety glass)

My verdict

Over 100 growers have purchased this light and reviewed it highly.

I definitely recommend the Viparspectra PAR1200 1200W LED because with the features and capability offered, it’s a perfect fit as a single light for a 4×4 grow tent.

Click here to see reviews and prices for the Viparspectra PAR1200 on


MARS II 900W – One of the Best LED Grow Lights for 4X4 Grow Tents

best led grow lights

The second best LED grow light for 4X4 grow tents is this 900 watt variant by Mars Hydro. Mars Hydro is a famous brand for hydroponic and indoor cultivation tool manufacturing.

Mars Hydro made an effort to position themselves in the market of quality LED grow lights at affordable prices.

Why is the Mars Hydro 900 Watt Grow Light One of the Best LED Grow Lights for 4×4 Grow Tents?

This 900 watt LED grow light will get you the same coverage space (5’x5′ veg and 3.5’x3.5′ bloom)  as the Viparspectra PAR1200 we just finished reviewing. The only difference is the measured PPFD value is a bit lower at comparable heights. It’s also lower than the Mars Hydro 1200w CREE that I first mentioned above. However, it’s also half the price, and that doesn’t mean you won’t be able to grow luscious marijuana plants with it.

Consider that the Mars Hydro 900w has a lower cost, lower power consumption, a sufficient PPFD measurement, and still has dual light switches for veg and bloom cycles. That makes this light an incredible value and one of the best LED grow lights for 4×4 grow tent use.

Will the Mars Hydro 900w LED Grow Light Get Too Hot for a 4×4 grow tent?

best led grow lights

Thankfully no users have reported heat issues with this Mars Hydro variant so far. In fact they’re saying quite the opposite. One user said the fans are quiet, and temperatures dropped several degrees compared to their HPS grow light. One person said they own several LED grow lights and this model is cooler and quieter than the others.

Mars Hydro gave their 900w grow light 4 cooling fans and a large heat sink. The light is able to cool itself without help. This light is ETL certified meaning it’s compliant with North American safety standards.

What Else You Should Know About Mars Hydro 900w Grow Light In Your 4×4 Grow Tent:

The MARS II 900W Full spectrum light is built using extremely high-quality materials.

It’s equipped with 180 epistar and bridgelux LEDs at 5W each. They create highly effective full spectrum light effect which includes the range of bands between 400nm – 740nm and also includes essential white color and IR band.

Maximum PPFD value achievable from the height of 18” is 1267 uMol and hence we’d recommend you to keep it at 18” of height during flowering and 24” height during vegetation.

Moreover, from the height of 18”, you can achieve around 3.5’ X 3.5’ of coverage with ease on the other hand, from 24” you’ll quickly get around 4-4.5’ X 4-4.5’ of coverage for your plants.

As for power consumption, the light pulls around 372W from the wall.

Mars Hydro is a favorite brand among cannabis cultivators since it can deliver high-quality light at a very reasonable rate. Take it from the satisfied customers who already bought the product.

Along, with the perfect design for a 4X4 grow tent, high-quality light, performance capability and reasonable price mars hydro also offers 3 years of maintenance and customer support and 30 days money back for buyers.

Click here to see reviews and prices for the Mars II 900W on

Pros and Cons of Mars II 900W LED Grow Light

  • Sturdy and Strong Build
  • Effective Spectrum
  • Competitive Price
  • Highly intense and bright light for better health and growth of plants
  • Light effect maximizes at its best when set inside a reflective 4X4 grow tent
  • Reliable design for LEDs using Zener Diode
  • Cost effective in terms of power efficiency
  • Best footprint and PPFD results at this price
  • People using it has reported better flower quality after using it.
  • Coverage potential along with higher absorption rates.
  • Top notch cooling fans
  • Customer centric warranty and refund policy
  • It is not waterproof and needs extra caution when set near dripping water
  • Timer not included


BloomBeast A900 900w – COB LED Grow Light

best led grow lights

Our third recommendation for best LED grow light for 4×4 grow tents is a COB LED grow light from BloomBeast. COB is a style of LED board that combines multiple LED chips on one module. The result is brighter, more efficient lights.

Why is the BloomBeast A900 900w Grow Light One of the Best LED Grow Lights for 4×4 Grow Tents?

There are several reasons the Bloombeast A900 is a great choice for 4×4 grow tents. The PPFD measurement is enough to be comparable to the Viparspectra PAR1200 grow light, except the cost and power use of the BloomBeast A900 is significantly lower. It offers several dimming options for seedlings, vegetation and flowering cycles. The max coverage is 4×4. The true power draw is a mere 388 watts.

If this state of the art tech is basically as good as a 1200w competitor, why not choose it?

Will the BloomBeast 900w COB LED Grow Light Get Too Hot for a 4×4 grow tent?

best led grow lights

Based on customer reviews on several websites, there do not seem to be any heat issues with BloomBeast COB LED grow lights. As we’ve said, generally a high quality LED grow light will not produce much heat at all. It’s simply the nature of LEDs. 

What Else You Should Know About BloomBeast 900w Grow Lights In Your 4×4 Grow Tent:

The BloomBeast A900 900 watt COB LED Grow light is equipped with a combination of conventional LED chips and advanced COB placement in the center of the panel. The light uses top shelf bridgelux LEDs.

Combining all the lights it generates an optimal 13 spectrum effect which includes infrared, ultraviolet and white light bands. All in all, for spectrum, intensity and brightness we’d give 10 out of 10 to this Maxbloom grow panel.

The BloomBeast A900 COB LED grow light comes with an industry leading 5 year warranty.

Overall, users of this light seem to be very satisfied and it’s undoubtedly one of the best grow lights for 4×4 grow tents.

Click here to see prices for the BloomBeast A900 900w LED Grow Light on

Pros and Cons of BloomBeast A900 900w COB LED Grow Light:

  • PPFD numbers compare to 1200w Viparspectra
  • Highly intense and bright light improves growth
  • Using it inside a 4X4 grow tent gives it perfect room to perform at its best
  • Top notch materials used in its build
  • Separate knobs for better control
  • Power efficient light helps in saving bucks in longer run
  • Cooling and temperature balancing is at its best
  • 5 year warranty period is longest on the market at this rate.
  • It is not daisy daisy chainable.

My Verdict

COB technology is getting famous due to light effectiveness nowadays. A majority of growers are moving towards top rated COB grow lights since its most effective and modern technology as far as growing cannabis is concerned.

I recommend either the BloomBeast A900 for your 4X4 grow tent.


Click here to see reviews and prices for the BloomBeast A900 900w on


420 Expert Guide’s Bottom line for Selecting a Best LED Light for 4X4 grow tent:

Grow Light Model:How Many To Effectively Cover 4x4 Grow Tent?Click to see this grow light's details on Amazon

HLG 550 V2
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HLG 100 V2
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Advanced Platinum P300
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Phlizon 1000w COB
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Phlizon 3000w COB
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Mars Hydro 300w
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Mars Hydro 600w
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Mars Hydro 720w Reflector
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Viparspectra 300w
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Viparspectra 600w
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Viparspectra PAR1200
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Bestva 3000w
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G8LED 240w
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G8LED 900w
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Meizhi 600w
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King Plus 1000w
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Roleadro 1000w
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Phlizon 600w
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4X4 grow space is perfect as a general starter grow space.

I often recommend our readers to start with moderately sized space where our recommendation lies between 2X2 to 4X4. The prime reason for this recommendation is you can get better with this sized space. Also, it becomes easy to test things while growing in a 4X4 grow space.

One big secret you likely didn’t know about grow tents is that the interior reflective mylar actually increases the PPFD intensity on your plants. So whatever PPFD the grow light manufacturer is claiming, you can safely estimate up to 20% higher PPFD values if you’re using a grow tent.

If you choose to get a fan for your grow tent, check out my guide to grow tent fans, carbon filters and installation.

Nowadays, the majority of grow tent suppliers, and manufacturers provides reflective materials as interior fabric. So light can revert to the plant and to make it possible to absorb almost all the lights generated inside grow space.

We have cross-checked all the factors and we’ve verified the facts and figure by reaching out to the existing users.

To help in the decision-making process, we’d like to recommend these grow lights based on all around features and power efficiency.

If these lights are still out of your league, feel free to check out the best 600 watt LED grow lights. Just beware you’ll be sacrificing yield and coverage area unless you plan on daisy chaining the smaller lights.

Source: Viparspectra, DormGrow, MaxBloom, MarsHydro

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