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Multiple LED grow light setup for indoor grow room.How much light is enough to promote excellent growth in my plants?

That’s a question a lot of growers ask themselves at some point when trying to decide on the best grow light for their plants. Whether you're new to growing or you've been growing for a long time, figuring out how much light you need can be tricky.

If you’re feeling overwhelmed, don’t worry. We’ve created this guide to help you determine exactly how much light your plants will need in a grow tent or grow room environment.

Table of Contents

  1. Light Coverage
    1. Research Your Plants Specific Lumen/PAR Needs
    2. Determining Coverage for Your Canopy
  2. How to Figure Out Many Grow Lights You Need
    1. How to Calculate the Number of Lights You Need
    2. Determining the Necessary Wattage for Your Plants
  3. The Best Grow Lights for Your Grow Room
    1. Editor’s Choice
    2. Perfect for 5ft x 5ft Grow Spaces
    3. For Commercial Growers
    4. Best for Beginners
  4. Finding the Right Lights and Intensity for Your Grow Room

If you’re ready to grow your own plants and want to know how much light they’ll need, read on. We’ll give you tips on what to look for and what factors to keep in mind when considering your plants’ lighting needs.

Light Coverage

Multiple HPS grow light setup in indoor grow room.Knowing how much light your plants need isn’t as simple as choosing any light and then hoping for the best. You’ll have to take into account two important factors:

  1. Plant Coverage — This is pretty self explanatory and means the amount of light each individual plant will receive.
  2. Canopy Coverage — This type of coverage refers to the light that will be spread over the entire group of plants in your grow tent, otherwise known as the canopy.

Whether you’re going with plant coverage or canopy coverage, it’s essential to know how much PAR or lumens you’re going to need for optimal growth. Remember:

You might be asking yourself, “Why do I need to factor lumens/PAR? Can’t I just use a certain number of watts per square foot in my grow room?” While you could just base the amount of necessary light for your plants on the size of your grow room or grow tent, doing so won’t give you enough light intensity for all of your plants.

  • Plants require a certain amount of lumens or PAR to achieve optimal growth.
  • As such, it’s best to figure out the exact amount of lumens/PAR the specific plants you’re growing will need.
    • Notice that we're ditching the whole "x-watts/per sq.ft." method. Now, the coverage area of any given light will have varying PAR/lumens the further out from the center you go. That's why if you have a large growing area and need to use multiple lights, PAR and lumens is going to be especially handy.
  • This will allow you to figure out how much light they need more accurately than just trying to get a certain amount of wattage per square foot.

Research Your Plants Specific Lumen/PAR Needs

PAR chart for LED grow light measurements.It’s important that you research the lighting needs of the plants you plan on growing. While you could potentially get decent results from simply estimating, you’ll see the best yields and the healthiest plants with proper lighting.

  • Weak Light Intensity: If you don’t provide enough light for your plants, they’ll struggle to grow. This can lead to stunted plants and weak results. Not to mention, you simply won’t get the flavors and aromas you want out of your plants.
  • Too Much Light Intensity: Too strong of a light will also cause problems for your grow. If you give your plants more light intensity than what they need, you could end up burning them.

If you want to determine how much PAR or how many lumens you’ll need for each of your plants, it’s pretty simple. All you have to do is a bit of research to find the right values for the plants you want to grow.

  • Leafy greens like lettuce and spinach, for example, would need a PAR value of around 200.
  • Meanwhile tomatoes, which flower and produce fruit, would need a PAR value of 400 to 500.

Once you’ve figured out the lumens/PAR your plants will need, finding the right light or lights for your grow tent will be a lot easier.

Determining the Coverage for Your Canopy

LED grow light coverage for tomato plants.Once you know what your plants need to grow, it's time to figure out how much coverage you need.

But to figure that out, you've got to first measure the size of the overall canopy you need to light.

  1. Measure your canopy's length and width: Your canopy is the part of your plants that absorb light. This is what you want to measure when considering grow lights. Measuring the entire grow space will give you an inaccurate estimate of the necessary light for your plants.
    • Note: the size of your growing area is important because it's the area you can fit a certain amount of plants in.
  2. Measure your canopy's depth: Don’t overlook the depth of your canopy. You’ll need lights that are strong enough to penetrate deep into your plants. Simply covering the tops of your plants won’t be enough.
  3. Find the Best Grow Light(s) for Your Grow Tent or Grow Room: Now that you’ve determined the size and depth of your canopy, as well as the lumens/PAR you need, you can make the most informed decision and purchase the right grow light.
    • By knowing the PAR/Lumens your plants need, you'll be able to determine how strong of a light you need.
    • By knowing how much area you need to cover, you can figure out how strong of a light you'll need so that it can spread the light it gives off the higher its raised.

How to Figure Out Many Grow Lights You Actually Need

Grow tent with white LED grow light.As you can probably tell by now, asking yourself how many grow lights you need upfront is a bit too tricky and broad. Ultimately, a better question to ask yourself is:

How much strength and light intensity do my plants need, and how many lights will I need to achieve this goal?

Thankfully, you now know how to get the answer to that question. You’ve determined the amount of lumens or PAR that each of the plants you’re growing needs. You’ve also figured out the light intensity required for the size and depth of your canopy.

How to Calculate the Number of Lights You Need

Now that you have a general idea of how grow lights, lumens, and PAR work in your grow room, the question remains:

How exactly do you calculate the number of grow lights necessary for a successful harvest?

Here are some step-by-step instructions to help you figure out how many grow lights you'll need.

  1. Research the lumen and PAR requirements of the plants you plan on growing. Are you growing tomatoes? Cucumbers? Peppers? Herbs? Whatever it is you plan on growing is going to have unique lumen/PAR requirements, so start there when trying to decide how many plants you'll need in your grow room.
    1. Research the minimum and maximum requirements for your plants. Tomatoes, for example, have a minimum PAR requirement of 400 and a maximum PAR requirement of 500.
    2. Remember: The outer edges of your grow light's coverage are weaker. If you're only using a single light, keep in mind that the outer parts of your canopy will have weaker light intensity. Depending on the plant, you may need to invest in more than one light to ensure your entire canopy is receiving strong doses of light.
  2. Measure your canopy's potential size. Your plants will take up a certain amount of space in your grow room or grow tent. Measure the ideal space your plants will take up. By figuring out an accurate length, width, and height, you'll be able to decide on the proper grow light coverage and strength.
    1. Keep in mind the size of the plants you're going to grow. Ideally, you want to avoid crowding your plants together. For best results, be sure your plants have adequate space so they can grow comfortably.
      • If you have a small grow space but you want to grow large plants, you may only be able to fit 1 to 2.
      • If you're growing small plants, you'll realistically be able to fit more in that same small grow space.
      • Whatever the case may be, make sure you account for their growth so you have enough space for fully-formed plants.
  3. Choose a grow light based on the coverage and intensity your canopy will need. With all of the factors mentioned above taken into account, you should now be able to more accurately and easily select the perfect grow light or grow lights for your plants.
    1. Consider your grow light placement if you're using multiple lights. If you need even coverage across your canopy, aligning multiple lights will essentially create a third intense point by overlapping the light coverage on the edge of each grow light. This will give you 2 or more strong points of light coming from the center of the light footprint, as well as intense light in the places where intensity would normally drop off.

Determining the Necessary Wattage for Your Plants

400w HPS grow light PAR chart for 4x4 grow area.Figuring out the necessary lumens/PAR for your plants will determine the wattage you need from your grow lights.

When growing with HIDs (HPS and MH lights, for example), consider these options:

LED grow light PAR chart for a 4x4 grow area.If you’re using LED lights in your grow tent, you should consider these LEDs and their values:

  • S270 Advance Spectrum MAX LED Grow Light Kit (Price: $399.95) — An LED grow light panel like this S270 has a wattage of 220w, though its HID equivalent is 300w. The ideal footprint of this LED light 6sqft. Its max PAR rating is 455 PPFD at a 24-inch height. This makes it recommended for 1 to 2 plants.
  • S450 Advance Spectrum MAX LED Grow Light Panel (Price: $595.95) — This LED grow light runs off of 320w with an HID equivalent of 600w, making it a super powerful light. It has a footprint of 12sqft at a 3ft height and 17.5sqft at a 4ft height. It also has a PAR rating of 645 PPFD at a 12-inch height, so you can grow 4 to 5 plants through the vegging and flowering stages with no issues.
  • S900 Advance Spectrum MAX LED Grow Light Panel (Price: $995.95) — You’ll get a lot of power from an LED like this. Its actual wattage is 605w, but it has an HID equivalent of 1200w. The PAR rating for this light is 1131 PPFD at a 12-inch height. That means its footprint of 21sqft at 3ft height or 30sqft at 4ft height will provide coverage for 7 to 10 plants.

As you can see, grow lights with different wattages provide coverage for different numbers of plants. The key is to find a grow light that has the right amount of lumens or PAR for the plants you’re growing — and from there you’ll decide on wattage.

Need Stronger Coverage? Here's What to Do

Now, lumens and PAR begin to weaken on the outer edges of that footprint. You’ll want to keep your plants well within that footprint. If you’re growing a lot of plants in a larger space, your best bet is to install multiple grow lights to overlap those weak points.

  • For more intense coverage, one option is to lower your light closer to your plants. The lower a light is, the more intensely your plants will feel it. However, doing that will decrease your coverage area.
  • For increase intensity, you can add more light(s) to your grow. This has the potential for increase PAR significantly, so it' important to raise or dim your lights if it's starting to get overwhelming for your plants.

Need to Cover More of Your Canopy with Light? Here's the Solution

If you need to cover a large area (like in a commercial grow, for example), you’ll want to use multiple high lumen output grow lights that you can hang higher than usual. Multiple lights also help give your plants much more intensity- as we've already demonstrated. But there are a couple of key things to look out for when you need a larger footprint across your canopy:

  • Hanging Lights Higher Increases Coverage Area, Lowers Intensity- To get more coverage, the first thing to do would be to raise your lights. Keep in mind the higher you position the lights in your grow tent, the weaker their intensity will be on your plants. So be aware of how much light you're sacrificing if you need to raise your light.
  • Re-evaluate your needs- If your plants need more intensity and/or coverage than you're giving them and you're running multiple lights already, evaluate the lighting you have. You may need to upgrade your lighting to stronger lights.

The Best Grow Lights for Your Grow Room

Now that you know the importance of lumens and PAR in relation to your grow room, it’s time to pick out the best light or lights for your grow room. Below are some of our top recommendations. Whether you’re going with HIDs or LEDs, we’re sure you’ll find the perfect light grow light for your plants.

Editor’s Choice: Yield Lab 600W HPS+MH Air Cool Hood Reflector Grow Light Kit and S450 Advance Spectrum MAX LED Grow Light Panel

Yield Lab 600W HPS+MH Air Cool Hood Reflector Grow Light Kit for indoor grow tents and grow rooms.If you want an all-around excellent HID grow light, we recommend the Yield Lab 600W HPS+MH Air Cool Hood Reflector Grow Light Kit.

This HID kit will give you great coverage and light intensity for up to 6 plants. And because it includes both an HPS bulb and MH bulb, your plants will be good to go for their vegetative and flowering stages.

Though HIDs are known for higher temperatures than LEDs, you can keep the light’s heat controlled with the digital dimming ballast. On top of that, this kit also features an air cool hood, so your grow room’s temperatures will never reach extreme levels.

HPS and MH Grow Light Specs

  • Wattage: 600w
  • Lumen Output: 90,000 lumens (HPS bulb); 61,000 lumens (MH bulb)
  • Coverage: 4 plants (2x4 grow tent or 4x4 grow tent)

Our Price: $219.95 | Click Here to Buy This HID Grow Light

S450 Advance Spectrum LED Grow Light Panel.Speaking of great grow lights, the S450 Advance Spectrum MAX LED Grow Light Panel is an excellent choice for growers of all skill levels.

This LED grow light provides coverage for up to 6 plants. And because it uses up a fraction of the wattage of its 600w HID equivalent, it also means a lower electric bill in the long run. Not to mention, LEDs naturally run cooler than HIDs, which means less ventilation equipment in your grow tent.

LED grow lights are known for their versatility. This LED panel is ideal for grow tents of varying sizes, from 2x4 tents to 4x4 tents. It’s also a solid choice for 4x5 all-in-one grow tents with separate sections for vegging/flowering and clones.

LED Grow Light Specs

  • Wattage: 320w
  • HID Equivalent: 600w
  • Max PAR Rating: 645 PPFD at a 12-inch height
  • Coverage: 4 to 5 plants (2x4 grow tent, 4x4 grow tent, or 4x5 grow tent)

Our Price: $595.95 | Click Here to Buy This LED Grow Light

Perfect for 5ft x 5ft Grow Spaces: Yield Lab Pro Series 1000W HPS+MH Air Cool Hood Double Ended Complete Grow Light Kit and 600 Watt Advance Spectrum MAX LED Grow Light Bar

Yield Lab Pro Series 1000W HPS+MH Air Cool Hood Double Ended Complete Grow Light KitThe Yield Lab Pro Series 1000W HPS+MH Air Cool Hood Double Ended Complete Grow Light Kit is all about big coverage and intensity.

This HPS and MH grow light kit will provide the necessary lumens to up to 6 plants in a 5x5 grow tent through the vegging and flowering stages. The power of this 1000w light is perfect for providing the coverage and depth to reach all of your plants.

If you’re growing plants in a 5x5 space and you’re looking for an HID grow light, it doesn’t get much better than this HPS and MH light kit.

HPS and MH Grow Light Specs

  • Wattage: 1000w
  • Lumen Output: 159,200 lumens (HPS bulb); 85,200 lumens (MH bulb)
  • Coverage: 6 plants (5x5 grow tent)

Our Price: $305.95 | Click Here to Buy This HID Grow Light

600w LED grow light bar for indoor grow tents and grow rooms.The 600 Watt Advance Spectrum MAX LED Grow Light Bar is one of the best lighting options for 5x5 grow tents and grow rooms.

You’ll get all the perks of LED lighting, including a wide spectrum of light, huge coverage for 6 plants, and energy conservation. Don’t let its name fool you — though this is a 600w LED, it has an HID equivalency of 1000w. That means intense light and penetration for your plants.

For maximum coverage and a wide spectrum of light for your plants, this is the LED grow light for the job.

LED Grow Light Specs

  • Wattage: 600w
  • HID Equivalent: 1000w
  • Max PAR Rating: 855 PPFD at a 12-inch height
  • Coverage: 6 plants (5x5 grow tent)

Our Price: $779.95 | Click Here to Buy This LED Grow Light

For Commercial Growers: Yield Lab Professional Series 120/220v 630w Dual Bulb CMH Open Wing Complete Grow Light Kit and Horticulture Lighting Group 650W Scorpion Diablo Full-Spectrum LED Grow Light

Yield Lab Professional Series 120/220v 630w Dual-Bulb CMH Open Wing Complete Grow Light KitFor growers working with a lot of plants, the Yield Lab Professional Series 120/220v 630w Dual Bulb CMH Open Wing Complete Grow Light Kit will get you huge results.

This CMH grow light kit’s open wing design allows for a wide, even spread of intense light that will penetrate deep into your plants. That means optimal growth thanks to all that light your plants will be exposed to.

In addition to giving you bountiful harvests, this kit runs cooler than most standard HPS and MH grow lights. This is a nice bonus since this kit is best used in conjunction with multiple grow lights to cover large spaces in bigger grow tents or commercial grows.

HPS and MH Grow Light Specs

  • Wattage: 630w (2 bulbs x 315w)
  • Lumen Output: 33,000 lumens per bulb
  • Coverage: 6 to 9 plants (5x5 grow tent or grow area, 6.5 x 6.5 grow tent or grow area)

Our Price: $379.95 | Click Here to Buy This HID Grow Light

650w full-spectrum LED grow light for indoor grow rooms and grow tents.If you need great coverage and penetration, the Horticulture Lighting Group 650W Scorpion Diablo Full-Spectrum LED Grow Light will give your plants exactly what they need.

This LED offers a full spectrum of light perfect for 5x5 to 6.5x6.5 grow areas. Ideal for commercial grows, this light keeps heat at a minimum, so if you’re using multiple lights in a warehouse, you won’t have to worry about intense temperatures.

Do you need a lot of coverage space for your commercial grow? Look no further than this LED grow light!

LED Grow Light Specs

  • Wattage: 650w
  • HID Equivalent: 1100w
  • Max PAR Rating: 1900 PPFD at a 12-inch height
  • Coverage: 6 to 10 plants (5x5 grow tent or grow area, 6.5x6.5 grow tent or grow area)

Our Price: $1,399.00 | Click Here to Buy This LED Grow Light

Best for Beginners: Yield Lab 400W HPS+MH Wing Reflector Grow Light Kit and S180 Advance Spectrum MAX LED Grow Light Kit

Yield Lab 400W HPS+MH Wing Reflector Grow Light Kit for indoor grow rooms and grow tents.Looking to start small? The Yield Lab 400W HPS+MH Wing Reflector Grow Light Kit is the best HID grow light kit for beginners.

This kit includes HPS and MH bulbs to help your plants get through all stages of growth. It’s perfect for 1 to 2 plants, though you could potentially squeeze in a third small plant.

At 400w, you’ll get enough light intensity for a small grow. In addition, priced at under $150, this grow light kit is a great way to get introduced to indoor growing!

HPS and MH Grow Light Specs

  • Wattage: 400w
  • Lumen Output: 55,000 lumens (HPS bulb); 36,000 lumens (MH bulb)
  • Coverage: 1 to 2 plants (2x2 grow tent)

Our Price: $149.95 | Click Here to Buy This HID Grow Light

S180 Advance Spectrum MAX LED Grow Light Kit for indoor grow tents and grow rooms.For beginners or growers who just want to grow 1 or 2 plants at a time, the S180 Advance Spectrum MAX LED Grow Light Kit is an awesome light for small-scale growing.

You’ll get all the perks that larger LED grow lights offer, but this light is specifically designed for growers who just want to keep things small or who don’t have a lot of space. Whatever the case may be, with this LED grow light you’ll get a full spectrum, deep canopy penetration, and nice intensity.

If you want solid yields from your small grow, this LED will get the job done with no problem.

LED Grow Light Specs

  • Wattage: 145w
  • HID Equivalent: 250w
  • Max PAR Rating: 531 PPFD at an 18-inch height
  • Coverage: 1 to 2 plants (2x2 grow tent or smaller grow tents)

Our Price: $299.95 | Click Here to Buy This LED Grow Light

Finding the Right Lights and Intensity for Your Grow Room

Multiple grow lights for indoor growing.You can’t overlook the importance of light in your grow tent or grow room. Your grow lights make up one of the most important parts of your indoor grow.

Whether you’re using HID grow lights or LED grow lights, you’ll want to make sure you provide the right amount of intensity and coverage for your plants.

With the information and tips in this article, you’ll know how to effectively calculate the necessary lighting for your canopy. That way you’ll see rich harvests and have peace of mind knowing that your plants aren’t lacking exactly what they need.

Editor's Note: This article was originally published May 7, 2015, and has been updated for accuracy and detail as of April 20210

36 comments

CBDiva

“Wow, this was extremely helpful! Thanks for putting it in language that a beginner like me can understand.

Most growers just generalize & tell ya to put all CFL’s about 4"" from the plant regardless of how many watts it is. I never questioned this until now. I also use a 20-watt LED gooseneck lamp for supplemental lighting & was pleasantly surprised to see you included low-wattage LED’s in your explanation."

puma 70 off

“Very good write ,reasonable advice. thanks a lot i got alot of information about out of this alone. "

Tylor Rainey

Yes i ordered a high pressure sodium grow light system its only 150w bc i wanted to try it out at first bc i started a second grow bc my first grow came out horible out of 22 plants i got 5 good ones bc i had cheep led grow lights i axsholy spent 150 dollars on a good 600w led full spectrum grow light in my grow tent and its bringen some of my plants back to life bc i thought when i transplanted one i killed it bc the bottom leavez turned yellow and then brown when i got the good grow light in it seams to be bring some of my plants back to life but for the hps system i ordered i got a 150w one how high over top of ur plants that just poped out of the ground 2 days agi should u hang it can u give tell me like how many inches should it be from the plants to get the best grow im gonna eventually up tge wattage or i might just us the 150w hps kight till they get a good hight and then stick them under my good grow light bcbit pased the cfl i think thats wat its called grow test the led i bought

DJ

“Hey so I know this thread hasn’t had activity since ‘19 but I just wanted to throw this out there. My grow space is a 36”x36”x72” space. I’m only going to grow a single plant at a time since my needs are small and based on conversations I’ve had with long lasting reputable seed banks. Based on the banks info the yields are based on 1 meter squared which is 3.26feet so my space is perfect for that; some strains list this measurement and recommend a 600w light to go with it but that seems like over kill. I currently have a single (all-in-one) 150W HPS light but I’m currently debating an upgrade and there are two choices I’ve whittled it down to and wanted to get some in-depth advise. Should I get a second of my current lighting system so I’d have 2 150W HPS or should I go with a single 315W CMH/CDM.
Climate control isn’t an issue since I have the ability to keep the temp stable between 68-80 degrees Fahrenheit within a 2 degree margin of error and my humidity and ventilation are solid as well as augmented CO2 levels so it really comes down to just the light. Any input would be greatly appreciated and the more the better. Stay safe and best wishes to all.”

Alex

“I agree with Aaron.

If you divide the square footage of the area by 4 square feet per plant, you should get the number of plants that can fit in the area.

From the above example:
240 square feet/4 square feet per plant = 60 plants.

I don’t understand why the area of the canopy is not just the same as the area of the room you’re lighting."

Rich

This is my first attempt to grow using 2 plants with light power of 60 led bulbsafter 40 days they are doing fine do i need other strength lights

Devin Martinez

“Hello Michael,

The proper distance for the <a href=""https://growace.com/grow-light/600w-grow-light-kits.html"" target=""_blank"" rel=""noopener nofollow"">600w Grow Light Kits would be 14″-25″ away from plants. You can read more about that on our<a href=""https://growace.com/blog/how-high-should-your-grow-lights-be-above-your-plants/"" rel=""noopener"" target=""_blank""> How High Should Your Grow Lights Be Above Your Plants? post."

Devin Martinez

“Hello Lee,

We would love to help you out with that for a 10×20 Grow Room you can fit up to 12 mature plants or up to 30 smaller sized plants. However, in regards to the lighting you would need to go with the <a href=""https://growace.com/grow-light/1000w-grow-light-kits.html"" target=""_blank"" rel=""noopener nofollow"">1000w Grow Light Kit to get you started. Now if you were looking to go with LED lighting you would need 2x S<a href=""https://growace.com/grow-light/led-grow-lights/full-spectrum/810-watt-advanced-spectrum-max-3w-chip-modular-led-grow-light-panel.html"" target=""_blank"" rel=""noopener nofollow"">810 Advance Spectrum MAX LED Grow Light Panel to equal the lighting that you will need for this size tent of coverage of plants."

Michael Shutler

What is the proper distance I should have my 600 watt MH optimized vegetative growth light from my plants that are in vegetative? Also can you change a male plant in to a female that just started to sex?

Devin Martinez

“Hello Kyle,

For the <a href=""https://growace.com/grow-tent/yield-lab-grow-tents/yield-lab-two-door-48×24×60-reflective-grow-tent.html"" target=""_blank"" rel=""noopener nofollow"">Yield Lab 48” x 24” x 60” Reflective Grow Tent this will need at least a <a href=""https://growace.com/grow-light/400w-grow-light-kits.html"" target=""_blank"" rel=""noopener nofollow"">400w Light Kit coverage. Any of our 400w Kits would work best with this selected tent for you."

Devin Martinez

“Hello Joe,

What a great question you asked here!
However, you might want to stay right where you are in regards to the lighting. Due to overkill of the plants if you were to add more lighting in a 4×4 tent it would be to much coverage and heat for the plants. You should be good to go with 960 watt of what you are working with right now."

Lee

How many lights do I need in a 10×12 room? And how many plants can i grow in the 10×12?

Devin Martinez

“Hello Maffie,

No need to worry we got you covered although you were fairly close you were off just a bit. Your total wattage would be 140w in this case 140w would not equal to any light in particular exactly so you would need to get the wattage closes to what you will need. In this case you will go for LED with the <a href=""https://growace.com/450-watt-advanced-spectrum-max-3w-chip-modular-led-grow-light-panel.html"" target=""_blank"" rel=""noopener nofollow"">Advance Spectrum MAX S450 LED Grow Light Panel. If you were looking to go with an HID set up then our <a href=""https://growace.com/grow-light/400w-grow-light-kits.html"" target=""_blank"" rel=""noopener nofollow"">400w Grow Light Kits will also get the job done for you."

Devin Martinez

“Hello John!!

We got you covered!
You’re right, if you were looking to cover 4 plants in a 4×4 area 1000w would be too much coverage for your plants. In a grow room up to 4×4 we would suggest getting the coverage of 600w HID lighting or either and 600w of LED lighting. The 1000w would be too much heat for your plants and can cause serious damage, swap it to 600w of LED and you will be just fine."

Joe

I have a 4×4 gent with a mars 960 watt should I add a 125 watt cfl

Devin Martinez

“Hello Donald,

Great Question!

With the<a href=""https://growace.com/fan-filters-co2/fan-filters.html"" target=""_blank"" rel=""noopener nofollow""> Fan & Filter combinations you would place the filter on the outside of the tent or either both inside as well. It all depends on what the fan is being used for either the intake are the outake. For more information check out our post about<a href=""https://growace.com/blog/hydroponic-grow-tent-fan-and-filter-setup-tutorial-growtent-design-growace/"" rel=""noopener"" target=""_blank""> Hydroponic Grow Tent Fan and Filter Setup Tutorial. We also have a helpful <a href=""https://youtu.be/6JHBEG1x0n4"" target=""_blank"" rel=""noopener nofollow"">Youtube Video as well."

Devin Martinez

“Hello Sam,

Good Going! You will be able to fit around 20 plants. However, it depends on the size of the plants you were looking to grow as well if they were large size plants you can probably fit a little less than 20 but if you were going with smaller sizes then you would be just about good with 20 for that exact size."

Devin Martinez

“Hello Andy!

We would love to explain this a little bit more for you. Once you multiply the 16×65 the number you will get is 1040 and you would take that number and divide it by 2. You will get that to equal to 520 when you are in this range in between you would go with the bigger number. So if you are at 520 which is in between 400w and 600w you would want to go with the bigger wattage of 600w to insure you get the best coverage for you plants. We hope this information was a bit more helpful for you, please let us know."

Devin Martinez

“Hello Hayden!

You are correct that is a bit too low for your area and for your plants. What the coverage of the 4×4 tent you would want to make sure your wattage is to around <a href=""https://growace.com/grow-light/600w-grow-light-kits.html"" target=""_blank"" rel=""noopener nofollow"">600w if you were going with the HID lighting. If you were working with LED lighting you would equal that up with 2x <a href=""https://growace.com/grow-light/led-grow-lights/full-spectrum/450-watt-advanced-spectrum-max-3w-chip-modular-led-grow-light-panel.html"" target=""_blank"" rel=""noopener nofollow"">S450 Advance Spectrum MAX LED Grow Light Panel. Please do not hesitate to ask us if you need any more information."

Devin Martinez

“Hey Cody!

We definitively do understand no worries we would love to help you out. For the size tent you do have the LED wattage that you were using would be too much for your plants. The total wattage that would equal out to about 520w so we would move up to an wattage cover of around 600w. We would recommend using the <a href=""https://growace.com/grow-light/600w-grow-light-kits.html"" target=""_blank"" rel=""noopener nofollow"">600w DE Kit or the <a href=""https://growace.com/grow-light/led-grow-lights/full-spectrum/450-watt-advanced-spectrum-max-3w-chip-modular-led-grow-light-panel.html"" target=""_blank"" rel=""noopener nofollow"">S450 Advance Spectrum MAX LED Grow Light Panelthat would equal the same. We hope we were able to help you out a bit today."

Devin Martinez

“Hello Vicky,

Thank you so much for your question we would love to help you out!
Although this is a smaller tent you can still get the best coverage for an LED light. You would want the wattage of around 300-600w.
The<a href=""https://growace.com/450-watt-advanced-spectrum-max-3w-chip-modular-led-grow-light-panel.html"" target=""_blank"" rel=""noopener nofollow""> S450 Advance Spectrum MAX LED Grow Light Panel would give you all the coverage that you would need with the wattage of 320w that is also equivalent to 600w. We hope this information was helpful for you, happy growing!"

Devin Martinez

“Hello Chad!

Yes, to answer your question this would be an overkill to your plants. In a tent size that small you would want to work with about 600w of either HID lighting or LED lighting. We would recommend using this wattage so you do not damaged or kill the plants. We hope this was helpful for you, please do not hesitate to ask us if you need any more further assistance."

Devin Martinez

“Hey Michael!

We can help you out with that in that! In this particular area coverage you would want to go with something as to the 400w range. If you were looking to with with an HID lighting our <a href=""https://growace.com/grow-light/400w-grow-light-kits.html"" target=""_blank"" rel=""noopener nofollow"">400w Grow Light Kits will do the job. As far as LED lighting the <a href=""https://growace.com/450-watt-advanced-spectrum-max-3w-chip-modular-led-grow-light-panel.html"" target=""_blank"" rel=""noopener nofollow"">S450 Advance Spectrum MAX LED Grow Light Panel
would not only get the job done but will save you way more energy."

Devin Martinez

“Hello Kyle!

You are correct! If you were looking to get the grow tent of that particular size you would need to have at least a 300w LED grow light. Now, all you would need is one of these<a href=""https://growace.com/450-watt-advanced-spectrum-max-3w-chip-modular-led-grow-light-panel.html"" target=""_blank"" rel=""noopener nofollow""> s450 Advance Spectrum MAX LED Grow Light Panel. With this grow panel will not only cover the area for you but would also make sure your plants are looking their best."

Jade

Hi there, i have a 4×4 tent. Running a 600w Led Viparspectra. I did the calculations and i ended up with 270watts,The ladies seem to be enjoying it. Especially when the light is a bit further away. Thanks buddy! Great read any advice would be great!

Michael

I ahve a 24×24×36 what light should i use I ahve a 24×24×36 what light should i use

Vicky Martin.

“Hi,

Thank you for this great Article.

Just to be sure, I have a 50*50 grow tent. (length:50 cm and height 50 cm). Whats the best watts led you would recommend for an optimal grow. In other words, how many watts do you think i would need for the best grow considering its only a small grow tent.

Thank you for you help in advance :)"

chad pilar

great info. i am a 1st time grower. bought a morsen 3000 watt led. i put it in my 4×4 grow tent. is this overkill?

Christopher Castle

I have a 48×48×78 tent with a 400 watt mh hps light and dimmable ballast. How many plants can i grow and get a good yield? Or how many Auto flowers can i grow if i bush them out.

Christopher Castle

I have a 48×48×78 tent with a 400 watt mh hps light and dimmable ballast. How many plants can i grow and get a good yield? Or how many Auto flowers can i grow if i bush them out.

Christopher Castle

I have a 48×48×78 tent with a 400 watt mh hps light and dimmable ballast. How many plants can i grow and get a good yield? Or how many Auto flowers can i grow if i bush them out.

Timmy

Great article! This is something that i was struggling with but after reading this i am good to go. I would love to learn more keep them coming. Much appreciated for a fella like me.

Devin Martinez

“Hey Zack!

We are glad to hear that, we are here Monday-Thursday 8:30am to 5:00p PST and on Fridays until 4pm PST if you need any assistance. Happy Growing!!"

Devin Martinez

“Hey Zack!

We are glad to hear that, we are here Monday-Thursday 8:30am to 5:00p PST and on Fridays until 4pm PST if you need any assistance. Happy Growing!!"

Devin Martinez

“Hey There Gerald!

That is a great question! In regards to the CFL we would recommend keeping the same lighting for your cycle. For example if you were looking for more coverage you can replace the 300w LED for a higher wattage to cover your area. You can also replace the CFL fully to cover the full area as well, we do not suggest having the LED and CFL combined together."

Kyle

I’m getting a 2’x4’x6’ grow tent, if I did the calculations right I should only need a 300 watt led grow light for one plant. I want to do clones later and have 4 plants. If that a good enough light for my grow room

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