Best LED Grow Light For 4X4 Grow Tents – Pictures, Specs, and More
The best LED grow light for your 4x4 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 4x4 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 low 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 4x4 feet.
Heck, even entry level grow lights that are good quality don’t cover 4x4 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 4x4 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 4x4 Grow Tents:
- HLG 600H Quantum Board Kit
- Mars Hydro TS-3000 Quantum Board
- Timber LED Model 4VS COB
- Spider Farmer SF-4000 Quantum Board
Keep reading for details about each grow light:
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 4x4 or even 5x5 foot grow tent.
Why is the HLG 600H Grow Light the Best Grow Light for a 4x4 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 5x5, or 6x6 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 4x4 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 4x4 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:
||2.5 uMol/joule (high)|
|Peak Light Intensity:||~1500 ppfd|
||29″ x 15.5″ x 3.5″ inches|
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 4x4 tent vs. mediocre yield for cheaper lights
- Dimmable ballast
- Can be controlled using timer
- Requires easy assembly
The largest model of the Mars Hydro TS series happens to be perfect for a 4x4 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 4x4 feet of coverage.
This LED grow light will thoroughly cover a 4x4 grow tent or 5x5 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 4x4 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 4x4 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 4x4 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 4x4 grow tent.
Will the Mars Hydro TS-3000 get too hot for a 4x4 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 4x4 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.
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 4x4 grow tents. All the features and capabilities come together to make a 4x4 growing experience easy and stress free.
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
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 4x4 grow tent.
My third choice is a powerful COB LED grow light that’s sufficient for a 4x4 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 4x4 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 4x4 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 4x4 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 4x4 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.|
|Coverage Area:||4ft x 4ft|
|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:
Wow I was blown away coming from a blurple Chinese light. It’s perfect for my 3x4. It’s well built. It’s like staring into the sun and its growing strong plants.
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?
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
My final recommendation for the best LED grow light for a 4x4 grow tent or grow space would be the Spider Farmer SF-4000. It’s a relatively new brand, but the light is the same high performance quantum board design as other high end grow lights on the market.
I recommend this grow light as one of the best value picks for a 4x4ft space.
Why is the SF-4000 Grow Light One of the Best LED Grow Lights for 4x4 Grow Tents?
To say it simply, the Spider Farmer SF-4000 meets all the requirements you’ll need to illuminate a 4x4 foot space properly. The light is strong enough, and the coverage is uniform, with minimal intensity fading across the canopy.
As you can see in the image above, peak light intensity is 1300 micromoles in the center and between 500-800 micromoles in the 4 foot range. It’s plenty to grow you a respectable yield, and when you consider the price the SF-4000 becomes a very attractive option.
Are there stronger grow lights out there for 4x4 feet? Sure, but be prepared to pay top dollar. If you don’t mind, check out the Scynce LED Raging Kush.
Will the Spider Farmer SF-4000 Grow Light Get Too Hot for a 4x4 grow tent?
Based on customer reviews on several websites, it seems that the new quantum board designs do release some heat. With that said it’s manageable if you have an inline fan inside your grow tent.
What Else You Should Know About The Spider Farmer SF-4000 In Your 4x4 Grow Tent:
The SF-4000 is dimmable from 100% to 25% power. With that said, the only time I would dim this light is if I was growing seedlings, or if my plants were in the late flowering phase and growing too close to the light.
The light uses top-bin Samsung LM-301B LEDs to illuminate your space. They emit full spectrum 3000K, 5000K, infrared, and far red 660nm colors.
The Mean Well driver is the high quality industry standard for grow light drivers. This is where you’ll find the dimming screw for the SF-4000.
Overall, users of this light seem to be very satisfied and it’s undoubtedly one of the best grow lights for 4x4 grow tents.
Pros and Cons of the Spider Farmer SF-4000 LED Grow Light:
- Strong intensity numbers
- Using it inside a 4X4 grow tent gives it perfect room to perform at its best
- Top notch materials used in its build
- Power efficient light
- 3 years of free replacement parts, after 1 year you’ll pay shipping & repair fees.
- Somewhat limited warranty.
This new quantum board technology is spreading like the plague, and for good reason. Growers have decided that this is the best way to grow.
I would definitely recommend the Spider Farmer SF-4000 for your 4x4 foot grow space.
Check out what growers have grown with these grow lights so far (Pictures from Instagram):
Other Grow Lights You May Consider:
|Grow Light Model:||How Many To Effectively Cover 4x4 Grow Tent?||Click to see this grow light's details on Amazon|
HLG 550 V2
HLG 100 V2
Advanced Platinum P300
Phlizon 1000w COB
|Phlizon 3000w COB||Check Price|
Mars Hydro 300w
Mars Hydro 600w
Mars Hydro 720w Reflector
King Plus 1000w
AGLEX 2000w COB
AGLEX 600w COB
Other Questions I Receive From Growers Considering Grow Lights For 4x4 Grow Tents:
- How Many Plants Fit in a 4x4 Grow Tent?
It truly depends how large you intend to grow the plants. For example, you can train one plant to grow very wide and take up half of the tent. In that case the answer is two. Otherwise I recommend giving each plant 2x2 feet of space, so you’d be able to fit four plants total in a 4x4 tent.
2. How Many Watts Are Needed to Grow In A 4x4 Grow Tent?
The quick answer is 450 watts minimum based on the best LED grow lights that currently cover a 4x4 grow space efficiently. The long answer is that you shouldn’t put too much focus on wattage because there are grow lights that use 450 watts or more that won’t cover 4x4 feet properly. So I’d say wattage, coverage area, and light intensity are the main factors to consider together.
3. What Size Inline Fan Do I Need For a 4x4 Grow Tent?
I wrote a whole article on determining grow tent fan sizes here: My guide to grow tent fans, carbon filters and installation. The minimum power inline fan you’ll need for a 4x4 grow tent is ~250 cfm. That’s assuming use of a carbon filter and one bend somewhere in the ducting. Bending the ducting more than one time will require a little bit more power.
4. Is it better to grow with a grow tent or open space?
One big secret you likely didn’t know about grow tents is that the interior reflective mylar actually increases the light intensity (PPFD) 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. Grow tents also allow you to control temperatures and humidity more easily than an open space. I highly recommend using a 4x4 foot grow tent compared to an open space.
What else you’ll need after choosing a grow light for your 4x4 foot 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. You can run through my checklist here to make sure you have everything!
Cheers, and happy growing!
Based on the best LED grow lights that currently cover a 4x4 grow space efficiently the answer is 450 watts minimum.
The long answer is that you shouldn’t put too much focus on wattage because there are grow lights that use 450 watts or more that won’t cover 4x4 feet properly. So I’d say wattage, coverage area, and light intensity are the main factors to consider together.
It depends how large you intend to grow the plants. For example, you can train one plant to grow very wide and take up half of the tent. In that case the answer is two. Otherwise I recommend giving each plant 2x2 feet of space, so you’d be able to fit four plants total in a 4x4 grow tent.
The minimum power inline fan you’ll need for a 4x4 grow tent is ~250 cfm. That’s assuming use of a carbon filter and one bend somewhere in the ducting. Bending the ducting more than one time will require a little bit more power.
If your grow tent is too hot, try cooling the room where the tent is located by opening a window or using an air conditioner. If the grow tent is too cold you may need to buy a space heater for the room the tent is located in.
You can control humidity in your grow tent by using a humidifier or dehumidifier. If you’re using more than one grow light, you can better control humidity spikes by turning your lights off 15-30 minutes apart instead of all at once.
LED grow lights will cost more to cover a 4x4 grow tent, but they will use less electricity and generate less heat. HPS grow lights will cost less up front but use more electricity and generate more heat in your tent.
MARUO, Toru, et al. “Effects of Supplemental Lighting with Light-Emitting Diodes (LEDs) on Tomato Yield and Quality of Single-Truss Tomato Plants Grown at High Planting Density.” Environmental Control in Biology, Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists, 11 June 2012, https://www.jstage.jst.go.jp/article/ecb/50/1/50_63/_article.
Chandra, Suman, Hemant Lata, Ikhlas Khan, and Mahmoud Elsohly. “Photosynthetic response of Cannabis sativa L. to variations in photosynthetic photon flux densities, temperature and CO2 conditions.” Physiology and Molecular Biology of Plants 14.4 (2009): 299-306.
Eichhorn Bilodeau, Samuel et al. “An Update On Plant Photobiology And Implications For Cannabis Production”. Frontiers In Plant Science, vol 10, 2019. Frontiers Media SA, doi:10.3389/fpls.2019.00296. Accessed 14 Oct 2019.
Lin, K., Huang, M., Huang, W., Hsu, M., Yang, Z. and Yang, C. (2013). The effects of red, blue, and white light-emitting diodes on the growth, development, and edible quality of hydroponically grown lettuce (Lactuca sativa L. var. capitata). Scientia Horticulturae, 150, pp.86-91.