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 light intensity is high enough.

Why you can’t use any cheap grow light for a 4×4 space:

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 loq quality grow lights in this article. When you look at the light intensity and coverage space from cheap $60 grow lights, its not enough for anywhere near 4×4 feet.

Heck, even entry level grow lights that are good quality don’t cover 4×4 feet thoroughly.

My article about the minimum required light intensity (PPFD) for growing cannabis is a good explainer. You need 600 to 900 uMols of light on the whole grow space.

My recommendations are based which lights meet those criteria for a 4×4 grow space.

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:

Click To Expand Recommended Grow Light Comparison Table
ModelFeaturesCheck Price Below (via Amazon)


  • Strongest Light Intensity of the Whole List
  • Will grow maximum yield vs. cheaper lower intensity lights
  • Adjustable light intensity
  • Perfect Spectrum

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Mars Hydro TS-3000

  • Modern Quantum Board Design
  • Best Value For Performance
  • High PPFD

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timber led 4vs
Timber LED 4VS

  • Top Rated Brand
  • 4X4 Grow Tent Compatible
  • Strong COB LEDs
  • Only need 1 in a 4×4 tent

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BloomBeast A900

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

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HLG 600H Quantum Board Grow Light

hlg 600h

best led grow lights

This is Horticulture Lighting Group’s best LED grow light. The HLG 600H is the DIY kit version of the popular HLG 550 V2. Don’t be scared by DIY, assembly is actually very easy, and there’s a video instruction below if you need it. No soldering required!

The benefit of the HLG 600H is that it costs less than the HLG 550, but actually performs better! It’s perfect for a 4×4 or even 5×5 foot grow tent.

Why is the HLG 600H Grow Light the Best Grow Light for a 4×4 Grow Tent?

The HLG-600H is the best option because of the uniform and intense light released by these Samsung LM301B LEDs. Combine that with the full white light spectrum and you have a winner.

The spectrum is 3500K plus 600nm red. 3500K temperature is generally viewed as a balanced spectrum for both veg and flowering. 3000K is more geared towards flowering and 4000K is more geared towards vegetative growing.

Intensity and spectrum quality are the two most important factors as mentioned earlier, and the HLG-600H gets a 10/10 for both.

Check out this video to see the intensity test, and more:

Even at the edges of the coverage area, you’re getting intense light on your plants. This light will get you a maximum yield based on the 925 uMol recommended light intensity for a 12 hour flowering phase light cycle. The peak light intensity is ~1500 ppfd which is more than enough to cover 5×5, or 6×6 for veg.

This high light intensity could be too strong for a plant in vegetative phase, which is why you can dim the LEDs by turning a screw on the ballast. During flowering your plants will want all that intensity so you may not need to dim it.

Will the HLG-600H get too hot for a 4×4 grow tent?

The HLG-600H is passively cooled, but like all grow lights there’ll still be some heat. Make sure you have an inline fan and oscillating fan to control the environment in your grow tent.

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 HLG-600H Grow Light:

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 HLG 600H quantum board. This is the only light you’ll need. Other lights offering this level of quality are priced even higher.

Now for the other specifications:

Power Efficiency:
2.5 uMol/joule (high)
Peak Light Intensity: ~1500 ppfd
29″ x 15.5″ x 3.5″ inches
Power Draw:
620 watts

Pros and Cons of HLG 600H 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
  • Dimmable ballast
  • Can be controlled using timer
  • Requires easy assembly

Click Here to see the HLG-600H at LED Grow Lights Depot

Mars Hydro TS-3000 LED Grow Light

best led grow lights

The largest model of the Mars Hydro TS series happens to be perfect for a 4×4 grow space. The TS 3000 is a great value based on what you get from it. You’re getting a new, more efficient design at a pretty low cost for 4×4 feet of coverage.

This LED grow light will thoroughly cover a 4×4 grow tent or 5×5 veg space. Let’s take a look at some of the Mars Hydro TS 3000’s features:

Why is the TS-3000 one of the best LED grow lights for 4×4 grow tents?

The most important factors immediately come to mind. Light intensity, white light spectrum, modern design, and cost.

The light intensity (PPFD) comes in a little lower than the 1200w CREE discussed above, but weigh that against the modern fanless design and the lower cost. The 1150 micromoles of light coming from the TS-3000 is plenty to max out your cannabis plants.

At 11 pounds, all grow tents should be able to hang the TS-3000 with ease. These grow lights come with proper hanging equipment.

Control plant height in your 4×4 grow tent – Mars Hydro TS-3000w 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 Mars Hydro TS-3000 has a dimmer on the driver to make easy adjustments for the veg or bloom phases. 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.

The TS-3000’s intense light will ensure your plants don’t stretch because they’re hungry for additional light, meaning it’s easier to grow them at the size and height convenient for your 4×4 grow tent.

Will the Mars Hydro TS-3000 get too hot for a 4×4 grow tent?

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 Mars Hydro TS 3000 are perfect for use in grow tents.

The slim design of the TS 3000 makes it efficient for dispersing heat. With that said, all grow lights release some heat, and you may want to consider placing an inline duct fan and filter in your tent to maintain an ideal growing environment. Several owners of the light have written reviews and nobody has complained about heat thus far.

Other Specifications Of The Mars Hydro TS 3000 LED Grow Light In Your 4×4 Grow Tent:

The quantum board design is the most modern on the market. Compared to older grow light designs, the quantum board design does not contain cooling fans, and the light intensity (PPFD) doesn’t fade as much as you get to the edge of the coverage area.

The efficiency, or micromoles (uMol) per watt, is higher on quantum boards than more classic designed grow lights. That means you’ll get more light for the amount of power you consume.

The Mars Hydro TS 3000 LED grow light is equipped with 684 High quality LED chips. The light pulls ~300 watts from the wall, and Mars Hydro claims 2.2g per watt yield, although cannabis yields generally vary widely.

best led grow lights

The white light spectrum is scientifically proven better than pink/purple spectrum of the past. You get white light plus infrared with the TS-3000 grow light.

This LED grow light comes with a generous 3 year warranty and 30 day money-back guarantee. I know from personal experience that Mars Hydro responds quickly if you contact them.

In my opinion the Mars Hydro TS 3000 LED grow light is the second 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.

Click here to see reviews and prices for the Mars Hydro TS-3000 on

Pros and Cons of Mars Hydro TS-3000 LED Grow Light

  • Built using highly reliable materials
  • High intensity / PPFD numbers
  • Can be controlled using timer
  • Reported better yields by users
  • Worry free customer oriented warranty
  • Doesn’t feature daisy chaining ability
  • No veg/bloom switch

My verdict

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

I definitely recommend two Mars Hydro TS 3000 watt grow lights because with the features and capability offered, they’re a perfect fit for a 4×4 grow tent.

Click here to see reviews and prices for the Mars Hydro TS-3000 on

Timber LED Model 4VS

timber led 4vs

best led grow lights

My third choice is a powerful COB LED grow light that’s sufficient for a 4×4 grow space. It’s the Timber LED Model 4VS. These Timber LED COBs will cost you roughly the same as the two Mars Hydro TSL-2000 discussed above.

These lights are hand built to order in San Diego, CA, and ship out in about 5 business days. Combine the white light spectrum, strong intensity, and quality product and you’ll see why Timber LEDs are a great choice.

Why are the Timber LED COB Grow Lights One of the Best LED Grow Lights for 4×4 Grow Tents?

This true 425 watt LED grow light uses Bridgelux Vero 29 V7 COB LED chips to cover your canopy in strong white spectrum light. The light intensity (PPFD) peaks around 1080 uMols, just above what your plants need to maximize their yield (You can read more about daily light requirements here).

Timber LED grow lights are sufficient to get your plants through all stages of growth, and the light is dimmable from 10-100% intensity if you want to adjust it.

The video below is for the smaller version, the 2VL, which isn’t sufficient for 4×4 space. But you can get an idea of the light intensity towards the end where Erik begins to lift the sensor slightly off the floor and the PPFD rises drastically. You’ll be able to hang these lights around 18 inches from your plant tops, and you’ll get great results.

Will the Timber LED Grow Light Get Too Hot for a 4×4 grow tent?

You’ll notice the Timber LEDs don’t have fans, instead they have massive heat sinks on the top side of the grow light. Will Timber LEDs get too hot for your grow tent?

All grow lights emit some heat, so you may want to have a space fan or inline fan handy. With that said, heat coming from these lights will be much more manageable than HPS grow lights.

What Else You Should Know About Timber LED Grow Lights In Your 4×4 Grow Tent:

Timber LEDs are full spectrum lights built using high-quality materials. This is a hand made product compared to mass produced overseas product. It comes with a 3 year warranty and the company is based in the US.

  Timber LED 4VS:
Dimensions: 21 x 20 x 4 in.
Weight: 19lb
Warranty: 3 years
Coverage Area: 4ft x 4ft
Power Draw 425w
LED Brand Bridgelux Vero Gen7 COB
Cheapest Place to Buy: LED Grow Lights Depot

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.

Owners of Timber LED lights love them:

Some owners have left reviews for the Model 4VS on Timber LED’s site, and here’s what they had to say:

Written by Mike Green Grow on Apr 16th 2019

Wow I was blown away coming from a blurple Chinese light. It’s perfect for my 3×4. It’s well built. It’s like staring into the sun and its growing strong plants.

Written by SS on Aug 23rd 2018

Have almost a year using these lights. They procude the same quantity as a 600w HPS but the quality is definitely better! With low heat, energy efficient and rock solid parts/construction, these are the end all lights for indoor growing. Get the 3500K and changing lights will be a thing of the past! Can’t recommend more!!!

What quality plants are people growing with these lights?

timber led plant

Mobshine day 67 of flowering under a Timber LED grow light. Source: Instagram

timber led plant

Green Poison, day 27, under a #timberled 3500K spectrum. Source: Instagram

Click here to see reviews and prices for the Timber Model 4VS at LED Grow Lights Depot

Pros and Cons of Timber LED Model 4VS 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
  • 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.
  • Generous 3 year warranty
  • 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 would definitely recommend 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:

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.

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.

What else you’ll need after choosing the best grow tent:

If you’re just getting started growing indoors, you’ll likely need a few more items in addition to your grow tent. The growing environment is crucial to the quality of your crop. More specifically, you’ll need to maintain the right humidity levels and the right temperatures.

I wrote a few additional articles that summarize topics like Choosing the right size grow tent, Choosing and installing a grow tent fan for a 4×4 grow tent. So make sure to give them a read when you’re done with this one.

Cheers, and happy growing!

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My name is Nick, and I'm a home grower who spends time writing about indoor growing tools and setups. My goal is for 420ExpertGuide to be a one stop shop for indoor growers to find the information they need.