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

What’s the Best LED Grow Light for your 4×4 Grow Tent?

The best LED grow light for your 4×4 grow tent will be both lightweight and powerful enough to meet the needs of your marijuana plants. This is dependent on several factors like whether your grow tent can support the hanging weight of your grow lights, and whether your grow lights’ PPFD strength is strong enough to cover a 4 foot width.

We recommend using a minimum 900 watt led grow light for your 4×4 grow tent. 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 our 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 in our opinion. You’ll be missing out on 30% of your harvest. Stick with 900 watts and above.

3 Best LED Grow Lights for 4X4 Grow Tents:

ModelPlus PointsAffordable?
Viparspectra PAR1200
Viparspectra PAR1200 1200W LED Grow Light - Best LED light for 4X4 grow tent

  • Unique Design
  • Perfect Fit for 4X4 Grow Tent
  • PAR Balancing.

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Mars Hydro's MARS II 900 Watt LED Grow Light Review - Best Grow Light for 4X4 Grow tent setup

  • Top Rated Brand
  • 4X4 Grow Tent Compatible
  • 1267 uMol @ 18″ Height.

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BloomBeast A900 900w COB LED
Bloombeast A900 COB LED Grow Light for marijuana

  • Modern Tech
  • Suits well to 4X4 Grow Space
  • Best Quality Spectrum.

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Viparspectra PAR 1200W LED Grow Light – Editor’s Choice LED for 4X4 Grow Tent

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. Verified purchasers have complimented this model for its low to zero heat. 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:

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.

(Click image for more details)

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)

Our verdict

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

We definitely recommend Viparspectra PAR1200 1200W LED because with the features and capability offered, we decided to place it on the top of our list of Best LED Light for 4X4 grow tent.

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

MARS II 900W – One of the Best LED Light for 4X4 Grow Tent

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. However, 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:

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.

Now, if we talk about power efficiency, then it won’t disappoint you in this factor as well. Yeah, light pulls around 372W from the wall which is considerably lower than the higher output Viparspectra previously mentioned.

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

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

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:

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.

Our 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.

We’re recommending BloomBeast A900 900w grow light to all our readers in case you need a grow light for your 4X4 grow tent.

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

420 Expert Guide’s Bottomline for Selecting a Best LED Light for 4X4 grow tent

4X4 grow space is perfect as a general starter criterion.

We 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.

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

  • Nick
  • Updated May 20, 2019