There are several LED grow lights designed specifically for 4x4 foot grow spaces. These specific grow lights typically use at least 450 watts of power, and spread the light uniformly across the grow space so that even buds on the sides of your tent get enough light to grow large.
Why you can’t use cheap grow lights in a 4x4 space:
One of the biggest mistakes you can make when choosing a grow light for a 4x4 space is picking one that isn’t designed for 4x4 feet. The LED grow lights for this size space can be pricey, but buying a cheap grow light for 4x4 feet will be pricier in terms of the laughable yield you get.
So if you’re on a tight budget (under $200), you’d be better off choosing a 600 watt HPS grow light instead of an inexpensive LED model that underperforms.
When you look at the light intensity and coverage area from cheap $100 grow lights, its not enough for anywhere near 4x4 feet. So stick with a proper LED model or an HPS if you’re on a budget.
If you need a further explanation about plant light intensity requirements, My article about the minimum required light intensity (PPFD) for growing cannabis is a good explainer on light intensity.
The Best LED Grow Lights for 4x4 Grow Tents:
- Maxsisun PB4000
- 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:
One of the most inexpensive options to properly grow in a 4x4 foot grow tent – the Maxsisun PB 4000. It looks similar to other quantum board style grow lights because most manufacturers are now using this modern design.
Why is the Maxsisun PB 4000 One of the Best Grow Lights for a 4x4 Grow Tent?
The PB 4000 is one of the best options because of the modern design, but also because of the affordability. If you don’t mind having a grow light with less features than comparable models such as the Mars Hydro TS-3000 (below), then the PB 4000 is probably a good fit for you.
The Maxsisun PB 4000 is a close comparison to more expensive Mars Hydro and Spider Farmer, and uses a similar 400 watts from the wall. You won’t be able to dim this grow light, but you can always raise the height instead. Check out my article about grow light hang height to learn more about that.
Spectrum and Coverage
The spectrum is 3500K , 6500K, and 600nm red, which makes up a full spectrum light that’ll grow from seed to harvest. Its basically the same spectrum that all the higher priced options use.
The 400 watts is about 10% lower than close competitors like Mars Hydro or Spider Farmer, but it’s still enough to grow with. I wouldn’t want to go much below that in a 4x4 foot grow tent.
As you can see in the image above, the light intensity is pretty good for flowering at 18 inches hang height.
Will the Maxsisun PB 4000 get too hot for a 4x4 grow tent?
All grow lights above 200 watts make heat. You should have an inline fan and oscillating fan in your grow tent and it will be manageable.
PB 4000 Specifications:
|Power Efficiency:||2.7 uMol/joule (high)|
|Warranty:||90 day money back / 3 year|
|Peak Light Intensity:||~1089 ppfd @ 18in|
|Dimensions: ||24″ x 21″ x 2.5″ inches|
|Power Draw: ||400 watts|
Pros and Cons of Maxsisun PB 4000 Grow Light:
- Great price for the power & coverage
- Good warranty
- Can’t dim or remove drivers like more expensive competitors
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) on the Mars Hydro is stronger than the Maxsisun discussed above, but weigh that against the lower cost of a Maxsisun.
Light intensity is correlated to cannabis yield, so decide which factor is more important to you. At 400 watts vs 450 watts, the yield won’t be that much less with a Maxsisun.
At 11 pounds, all grow tents should be able to hang the TS-3000 with ease. These grow lights come with proper hanging equipment.
I always say you get what you pay for when it comes to grow lights. The Mars Hydro models have a nice feature that other models don’t have. It’s the extra cord length attached to the drivers, allowing you to hang them outside your grow tent and maintain a lower temperature inside the grow tent.
The Mars Hydro TS-3000 also has a dimmer on the driver to make easy adjustments for the cannabis veg or flowering phases.
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 Mars Hydro TS-3000 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. I bought the smaller SF-2000 for my 2x4 foot grow tent so I know these lights well. You can read my full Spider Farmer review here.
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 paying extra, check out the HLG 650R.
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):
Considering a 3x3 or 2x4 foot grow tent?
Other Questions I Receive From Growers Considering Grow Lights For 4x4 Grow Tents:
1. 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 LED Watts Are Needed to Grow In A 4x4 Grow Tent?
Let me distinguish between LED watts and true watts. LED watts can be the number of watts in the title – which is a misleading marketing tactic – or it can represent the total watts of the LED chips. Both of those numbers are irrelevant for determining what’s needed in a 4x4 grow tent. Take a look at the true watts number described below:
Each manufacturer provides a true watts number for their grow lights. I Recommend 450 watts minimum based on the best LED grow lights that cover a 4x4 grow space effectively.
You can get by with a slightly lower powered light like the 400 watt Maxsisun PB 4000 mentioned above – but only if you’re on a budget. I really recommend 450 watts as the minimum.
3. Do I need an oscillating fan for my 4x4 grow tent?
Yes! You need an inline fan and an oscillating fan. The oscillating fan will push air around and prevent mold and mildew spores from taking root. It’ll also provide the plants with a steady source of fresh air.
4. 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!
How Many Watts Are Needed To Grow Cannabis In a 4x4 foot Grow Tent?
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.
How Many Cannabis Plants Fit In A 4x4 Foot Grow Tent?
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.
What Size Inline Fan Do I Need For A 4x4 Foot 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.
How Do I Lower/Raise Temperatures In My 4x4 Foot Grow Tent?
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.
How Do I Raise/Lower Humidity In My 4x4 Foot Grow Tent?
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.
Should I Use LED or HPS Grow Lights In A 4x4 Foot Grow Tent?
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.