When it comes to growing indoors…
What type of light to use is one of the most confusing topics when you’re getting started.
While there are pros and cons for using any type of grow light…
There has been 1 type of grow light which has made massive strides in the past few years:
- Light Emitting Diode (LED)
Ask any experienced grower who has tried a quality LED light…
And most will tell you LED technology has come so far, that it actually has become the preferred method for growing your plants.
And with good reason.
Compared to other types of lighting LED is:
- Cheaper long term
- Needs little to no extra ventilation to cool your plants
- And gives higher quality yields (higher THC%)…
…but these benefits only hold true, if you get the right LED light!
Which is why in today’s post we will look at the 5 best LED lights currently on the market…so your plants will get the best food (light) and bless you with the highest quality yields.
But first some background information on this confusing topic.
Or go straight to the 5 best LED grow lights:
Let’s get started…
How to Rate LED Lights
Light is the MAIN INGREDIENT for growing high yield plants.
But how can you rate the quality of light?
Well, it’s specifically the:
- Range and ratio of different wavelengths/colors of light, and
- Your light’s intensity…
which are the most important when rating a LED light.
And the only REAL way to measure the range of wavelengths and your light’s true intensity is not by watts per square foot or lumens as most people think…
- PAR, and;
Let me explain what these abbreviations mean.
What’s PAR and Why It’s Important
PAR stands for ‘Photosynthetically Active Radiation’.
And although some LED light manufacturers (wrongly) use the term PAR when talking about a light’s intensity…
PAR is not a way to measure the intensity of your light…
But it’s the range for all the different wavelengths/colors of light that plants use for photosynthesis.
For your plants to grow optimally your LED light should have all the different wavelengths/colors of light that make up PAR…
But especially important are:
- The blue wavelengths (for vegetative growth), and;
- The orange/red wavelengths (for the flowering process).
Luckily…most LED manufacturers are aware of PAR and design their lights in such a way that most of the wavelengths/colors of light that fall within the PAR-range are present.
And the lights in THIS list actually have specific vegetation / flowering settings with optimized spectra for that specific stage in the growth-cycle, which are easily activated with a simple switch.
This is also the main reason why LED lights are more efficient than HID lights (HPS and MH).
HID lights emit ALL the different wavelengths/colors. This includes wavelength/colors that fall outside of the PAR range!
What this means is that HID lights actually waist quite a lot of electricity, because they’re using electricity for colors/wavelengths that fall outside of the PAR range and thus are useless for your plants!
If you get the right LED light, your light will only have the wavelengths/colors of light that fall into the range of PAR and wavelengths that fall into the deep and far red spectrum (which are important for the Emerson effect).
This means the full spectrum of wavelengths/colors coming out of your light are being used by your plants, and no electricity goes to waste.
But as you now understand…
PAR doesn’t say anything about the light’s intensity (in all these different wavelengths)…which is KEY in rating a light and getting strong plants with monster yields as well.
What’s PPFD and Why It’s Important
PPFD stands for ‘Photosynthetic Photon Flux Density’.
PPFD IS a measurement of light intensity and it says how many light photons that fall within the PAR-range (expressed in micromoles) hit a given square meter per second: μmol m(-2)s(-1).
A photon is the most basic and smallest unit of light.
Essentially, what PPFD does, is measure the intensity of your light.
This means to rate the quality of a LED light, PPFD is one of the most important metrics.
Of course, there are also metrics like:
- Build quality;
- How much heat the light generates;
- Reputation and reliability, and;
- Customer service;
That are important when considering your LED light…
But PPFD is what mostly matters to your babies (plants)…and then mostly the PPFD values in the blue (in the vegetative stage) and orange/red wavelengths (in the flowering stage).
Below is shown how much PPFD is needed MINIMUM for your Cannabis plants to grow and give you at least some yield:
- 255 μmol m(-2)s(-1) – 347 μmol m(-2)s(-1) PPFD on a 24 hours light schedule.
- 383 μmol m(-2)s(-1) – 520 μmol m(-2)s(-1) PPFD on a 18 hours light schedule.
- 510 μmol m(-2)s(-1) – 694 μmol m(-2)s(-1) PPFD on a 12 hours light schedule.
I can’t emphasize this enough:
This is absolutely the minimum for decent yield…especially in the flowering stage.
Your plants will grow and yield at a much better rate in the flowering stage if you get close to the optimum PPFD value between:
- 700 – 1500 μmol m(-2)s(-1)
This is the range where your plants will thrive in the flowering-stage on anything except a 24-hour light schedule…but a 24-hour light schedule isn’t the best practice anyway.
But keep in mind this is the average PPFD value.
For optimal results, you never want your PPFD to drop below 510 μmol m(-2)s(-1) and never to go above 1500 μmol m(-2)s(-1) at any given point of the coverage area.
The exact optimum PPFD value is a controversial subject, and is among other things, highly dependent on:
- Whether you’re supplementing with CO2;
- The growth stage in which your plants are: in the flowering stage your plants will need more intense light;
- Your specific strain: Sativa-dominant strains thrive under more intense light than Indica-dominant strains, and;
- Your light cycle: the longer your period of light, the lower the optimal PPFD value is and vice versa.
Can light be too intense?
The threshold of this is above 1500 μmol m(-2)s(-1). The exact value is also dependent on several factors like CO2-levels, your strain and temperature. But you won’t get there very easily with the lights in this list…
…as long as you respect the minimum distance as advertised by the manufacturer (more about that later)!
There’s a HUGE ‘but’ with PPFD though…
Even if we know the PPFD of a particular LED light, we usually don’t know how it was measured…
If you measure the PPFD in the area RIGHT below the light (in the center) you will get different values than further to the sides and corners. The further you get from the center, the quicker the PPFD values drop.
You will also get different PPFD values if you measure from different heights…the closer you measure to the light, the higher your PPFD will be.
So when reading PPFD values it needs to be 100% clear what:
- The distance was between the LED light and the canopy (or simply the floor);
- What the PPFD values were in the different parts of the coverage area, not only the center, and from different heights, and;
- The PPFD values are for the different wavelengths within the PAR-range (this one is tricky, and actually is almost never provided…but in an ideal world we would have this info as well).
If you have the PPFD values, including all this information, you have a reliable measurement and you can be quite sure how one light compares to another in terms of light intensity.
But the sad truth is:
Most LED manufacturers don’t provide all this info.
Either they provide no PPFD values at all or a general PPFD value, with no background information.
A single PPFD value without any background information is useless information…as it doesn’t tell us exactly about the light’s spread, its penetration or even its intensity really.
Note: Some LED manufacturers do provide PAR value charts (PPFD charts) of the light’s coverage area. It’s always worth it to ask for such a chart. Here’s how such a chart looks like:
If you want to an amazing yield, the PPFD should never drop below 510 μmol m(-2)s(-1) in the flowering stage. And as you can see, although the light get’s advertised with a 4×4 ft. coverage area, should you grow according to the 510 μmol m(-2)s(-1) rule, it would only cover between 2×2 ft. and 3×3 ft. So always take the coverage area of the manufacturer with a grain of salt.
If PPFD isn’t 100% reliable either…what’s left?
We don’t completely toss away PPFD in the garbage can…
Although it’s not the most reliable metric, it does say something…depending on the transparency of the LED company.
But if we really want to get a complete picture in a world where LED manufacturers just don’t provide reliable PPFD measurements…
We’re also simply going to have to look at the results of different lights in different growing setups…which means reading and comparing lots of grow journals.
And EVEN this rating process has many caveats…
You can’t just compare one setup to another…there are countless variables that impact the yield of a growth besides lighting.
Nonetheless, when we compare similar grow setups where only the LED light used is different…
We can very cautiously conclude which LED lights provide a higher yield than others.
So when rating the quality of the light or light’s intensity this is what we look at:
- PAR: which wavelengths have the highest output by the light. You want blue and red wavelengths mostly, but not only! You want the full PAR spectrum, including the greens. Plus the far red spectrum (which falls outside of PAR).
- PPFD: are there any values provided for different wavelengths in the PAR-range and do we know how it’s measured and/or calculated.
- Grow journals: compare the yield of in the same setups, where only the light differs (has many caveats as well!).
The bottom line when rating LED lights is:
Scientifically and 100% objectively rating LED lights is quite difficult at this time.
If manufacturers would bring out independently tested PPFD measurements with all the before mentioned background information, it would be easy.
Nonetheless, using PAR, PPFD and grow journals, we can get a very good idea of the quality of light coming out of a particular LED light.
Now you know how at least the quality of light coming out of a LED light should be rated…
It’s time you understand how many watts to get for your specific space/setup…
And although watts per square foot doesn’t say much about the light’s intensity…
It currently is one of the most reliable ways to really decide how big and powerful of a light you need to get for the size of your specific grow setup.
Unless of course you’ve got reliable PPFD / PAR value charts, but you probably won’t!
How to Choose a LED Light for Your Specific Setup Using Watts
As a general guideline, you should try to get a MINIMUM of 50 watts per square foot with a LED light. This guideline is by no means perfect, but will definitely help you get started.
50 watts per square foot means that:
- A 400W light will cover a 2.5 X 2.5 ft space.
- A 900W light will cover a 4 X 4ft space.
- A 1600W light will cover a 5 X 5ft space.
But here’s the kicker:
I’m talking about the real wattage value! The actual power draw, the actual watts that your light pulls out of the wall.
Let me explain.
Many LED light manufacturers give their specific model a name like ‘MARS II 400’. The confusing part here is the ‘400’. A MARS II 400 does not have a real wattage value of 400. Its actual power draw is 162 watts.
So ALWAYS look for the true wattage value / actual power draw of a light.
Don’t get confused by the name.
And when I’m talking about 50 watts per square foot, I’m talking about 50 watts of true wattage value /actual power draw per square foot.
Example: This means for example, with a 3×3 ft. space (9 sq. ft.), you will need at least 9×50 = 450 watts of actual power draw.
Why does all of this matter?
Most lights get advertised with a coverage area that’s grossly overstated not only when keeping the minimum of PPFD of 510 μmol m(-2)s(-1) rule in mind, but also when keeping the minimum of 50 watts per square foot in in mind.
What’s the bottom line when choosing a specific LED model?
There are 2 ways you can choose a specific model:
- Best method: You have PPFD / PAR-value charts and you make sure that no part of your growing area goes below a PPFD of 510 μmol m(-2)s(-1);
- Realistic method: You don’t have PPFD / PAR-value charts and you go for a minimum of 50 watts per square foot.
The first method will result in a better quality yield, but will be more expensive (you’ll need more ‘light’ to achieve this), and you’ll need reliable PAR-value charts which are often not provided.
The second method will result in a decent yield, and will be cheaper and easier most of the time (most LED manufacturers don’t provide PPFD / PAR-value charts…yet).
Also, do realize the following when choosing a specific model:
In many cases, it’s better to get multiple lower wattage LED lights instead of getting a single high wattage LED light, and position them in such a way that your plants are covered by light from different angles.
This is because LED just doesn’t have the best spread compared to other types of lights…and the more lights you have, the better you can position them and the better the spread of your light will be.
One last topic before we get to the 5 best led grow lights…
What’s the right distance to keep your LED lights from your plants
It’s extremely important that you put your lights as close as possible to your plants, because this will directly affect the potency of your buds…
But it’s just as important to not put your lights too close to your plants.
But what’s ‘too close’?
This is highly dependent on the light’s brand and model.
The more powerful the light, the higher the minimum distance has to be.
LED manufacturers always provide minimum distances with their products and you should absolutely use these.
Ultimately, you’re going to keep a close eye on your plants and act accordingly:
- Raise them in a few inch increments when they show signs of stress/light burn, and;
- Lower them when you feel your plants need more intensity.
Now that you know how to choose a specific size for your specific space…
Let’s get down to business with the 5 best LED lights.
1. MarsHydro Mars Pro II Epistar
MarsHydro stepped up their game with this light…
It’s their newest LED model and it’s a step up on what’s probably the most popular LED grow light in history: the MARS II.
The most notable improvements are:
- They come with upgraded Epistar High-Intensity (HI) LED chips for stronger light intensity and improved longevity;
- Upgraded drivers for efficient use of your electricity;
- Improved reflectors which don’t block any light;
- Improved vents to prevent heat-issues and increase longevity.
When comparing the PPFD charts, you’ll also see that the Mars Pro II has slightly better values all over the coverage area.
The best part?
This light is super-affordable.
Which makes this light the BEST value for money light you can get ($/Watts and $/PPFD).
It’s a budget-light, which comes close to the quality of high-end light.
You can EASILY get 2 MarsHydro Mars Pro II Epistar lights, for the price of 1 high-end LED light like one from Advanced LED (talking about same true wattage lights here).
Of course these lights come with a separate switches for the vegetative and flowering stage, so you won’t be wasting any electricity in the vegetative stage especially (you’ll need less light intensity in the vegetative stage).
And you can be sure the full light spectrum that’s needed to grow plants (PAR) is covered with any MarsHydro light, including the green spectrum and the far red spectrum, which is responsible for the Emerson effect.
What’s the main downside of this LED light?
The warranty isn’t the best (2 years) and the defect rate is a bit higher than true high-end lights.
These downsides don’t stop the MarsHydro Mars Pro II Epistar from taking the number 1 spot though…
And the main reason for this is the following:
When checking grow journals with the MarsHydro Mars Pro II Epistar…
You’ll see the yields are impressive. If you follow the rules in this guide, you’ll be sure to get dense buds with a proper THC %.
And MarsHydro probably has the biggest fan base of any LED grow light manufacturer.
If you are on a tight budget, this light is your best option.
You simply can’t argue with the value these lights provide considering their price point.
Which model(s) to pick for your grow-area.
Minimum PPFD of 510 μmol m(-2)s(-1) method (from 18 inches):
- Model: 80 / 400W (170 true watts) = 23cm X 23cm or 0.75′ X 0.75′ (0.56 square feet)
- Model: 120 / 600W (260 true watts)= 30cm X 30cm or 1′ X 1′ (1 square feet)
- Model: 160 / 800W (390 true watts) = 45cm X 45cm or 1.5′ X 1.5′ (2.25 square feet)
- Model: 320 / 1600W (750 true watts) = 69cm X 69cm or 2.25′ X 2.25′ (5 square feet)
With this method you’ll get an amazing yield. But keep in mind with this method, the coverage area will be WAY below the advertised coverage area and it will cost you quite a bit more.
Minimum of 50 watts per square foot method:
- Model: 80 / 400W (170 true watts) = 53cm X 53cm or 1.75′ X 1.75′ (3 square feet)
- Model: 120 / 600W (260 true watts)= 67cm X 67cm or 2.2′ X 2.2′ (5 square feet)
- Model: 160 / 800W (390 true watts) = 82cm X 82cm or 2,7′ X 2,7′ (7.5 square feet)
- Model: 320 / 1600W (750 true watts) = 115cm X 115cm or 3.8′ X 3.8′ (15 square feet)
With this method you’ll get a good yield. Again, the coverage area per light here is lower than listed by the manufacturer. If you keep the manufacturer’s coverage area in mind, you will get decent yield…but I hope you’re shooting higher than ‘decent’.
Important note: Always choose multiple lower wattage lights when you can, for example when using the 50 watts per sq. ft. rule:
- 2×2 ft. area: 2x 80 / 400W
- 3×3 ft. area: 2x 120 / 600W
- 4×4 ft. area: 1x 80 / 400W and 2x 160 / 800W
- 5×5 ft. area: 1x 320 / 1600W and 2x 160 / 800W
Next up we have another budget-light, the:
2. VIPARSPECTRA Reflector Series
The VIPARSPECTRA Refelctor is similar to the MarsHydro Mars Pro II Epistar light…
In that it’s a Chinese budget light which provides great value for its price.
The quantity and quality of your yield with these lights will be will be slightly worse than with the MarsHydro Mars Pro II Epistar…
This comes as no surprise as the light intensity (PPFD) of this light is the worst in the list (still very decent though).
The build quality of this light is also slightly worse.
But it’s also quite a bit cheaper!
In fact, this is the cheapest light in the list.
Go cheaper than this and you’ll set yourself up for disaster.
The VIPARSPECTRA Refelctor really is the cheapest you should go with a LED light.
Even though the full PAR spectrum, including the green spectrum, plus the far red spectrum is covered (for the Emerson effect)…
When you look at the ratios, you’ll see the blue spectrum has the highest ratio of the light’s output.
This means that especially in the flowering stage (in which the green to red spectrum is most important), you’ll find this light can disappoint compared to the other lights in the list.
So don’t be expecting miracles from this light…
But because its price is so low, you can easily get a few of these lights for a very modest sum of money.
If you’re looking for a budget-light:
I still do recommend the MarsHydro Mars Pro II Epistar as the number 1 budget-light.
It’s higher quality in all aspects and MarsHydro has been around longer and built a more solid reputation as a manufacturer of budget LED lights…
But if you’re looking for the cheapest of the cheapest, which will still get you good results…
This is the light you should go for.
For the majority of growers reading this, this is as far as they should go. Choosing one of the first three options in the list will keep the bill down and get the job done.
For those who are ready to take it a step up and don’t want to settle for a ‘decent’ light, let’s continue…
3. Advanced LED XTE
When we’re talking about ‘premium quality’ LED lights…
The Advanced LED XTE can’t be missing from the list.
This light operates with LED chips of the best LED brands:
- CREE, and;
The chips from these brands last 2 to 3 times longer than the standard Epistar and EPILED chips…which are used in 90% of other (budget) LED lights like the MarsHydro Mars Pro II Epistar or VIPARSPECTRA Reflector.
But what’s even more important:
The PPFD output of CREE and OSRAM chips is miles above Epistar and EPILED chips. You get almost double the intensity, for the same wattage chips.
A premium LED light wouldn’t be really premium if only the chips were top quality…the light as a whole needs to be top quality.
As it turns out:
The build quality of the Advanced LED light is so good…this light will last you 5+ years with EASE.
This light is built to last:
- You get a superb thermal design and run cooler than most other LED lights. A cool light is a happy light and will last longer;
- One problem which leads to overheating and other kinds of failures in ANY electronic device, is the build-up of dust…not with the Advanced LED lights. They have handy dust covers on their fans to prevent this detrimental process.
Add to that a reputation which really can’t be argued with:
Advanced LED has been around for at least 7 years…building a loyal fan-base of happy customers throughout these 7 years.
To survive AND build a loyal fan-base is remarkable in the LED industry. This industry is plagued by low quality products and companies with horrible customer service….
And you can only come to the conclusion that if you’re looking for a light that’s going to give you amazing yields, year in year out…without ever breaking a sweat…
The Advanced LED XTE is a top contender!
Next up is the KING of LED lights, the…
4. Amare SolarECLIPSE
If you’re looking to replicate the sun…
The Amare SolarECLIPSE is the closest you will get.
This is a full-spectrum light in the truest sense of the word:
While 90% of LED grow lights are so called ‘blurple’ lights, mainly providing PAR-output in the blue and red spectra…the Amare SolarECLIPSE is providing a very high PAR-output in the FULL spectrum, including the green spectrum! It has a very balanced ratio of wavelengths, including the far red spectrum which is needed for the Emerson effect.
It gets better:
UV-light has been proven to increase THC-percentages in cannabis…and this is one of the few lights that has an UVB-bulb.
This light is a true powerhouse.
Don’t take my word for it, check the PPFD readings with the built-in reflector array including removable lenses…
And you’ll see this light’s PPFD values are off the charts. Not only in terms of pure output…but also the coverage area:
The coverage area of this light is slightly higher than other same wattage lights in this list when using the minimum of PPFD of 510 μmol m(-2)s(-1) rule.
When looking at the actual power draw of this light, you’ll see this light has probably the highest PPFD output per watt (PPFD/WATTS).
What else can you expect with the cream of the crop in LED technology…
The LED chips used in this light are based on COB technology (chip on board). COB is slowly making its way into the LED world as the most efficient and most powerful LED technology.
COB LEDs are more efficient, last longer regular LED diodes, have a more balanced spectrum of wavelengths, and are much easier on the eyes than specific color LED chips.
Their main downside is that they’re a single-point light source, but Amare counteracted this by providing regular and supplemental CREE chips.
Here’s the exact compostion of this light:
- 6x CXB-3070’s, and;
- 60x CREE XP-G3 & XP-E2 Mono’s.
The light seems very well built overall…
But since Amare is a relatively new player you’ would be taking a small risk here…
Were it not for the 5-year warranty that comes with this light!
5-years of warranty is superb in the LED industry…shows you how much they trust their own lights.
What’s the bottom line?
If you’re looking for the absolute best in pre-made LED lights that money can buy…
If you’re looking for a quality of yield that will completely blow your mind…
The Amare SolarECLIPSE is the light you should get.
- Click to see most recent price – (LEDGrowLightsDepot)
Last in our list is the…
5. Advanced Platinum LED
The Advanced Platinum LED light is a relatively old light which has built a a proven track-record and many fans through the years.
This light provides a better light intensity (PPFD) per watt than the MarsHydro MARS II, MarsHydro Mars Pro II Epistar or VIPARSPECTRA Reflector series…
We compared many grow journals…and simply see that with a similar setup, Platinum LED lights provide a slightly better yield (quantity and quality).
From this we can also cautiously conclude that the PPFD values of this light are better.
It could also mean that these lights provide a better ratio of light spectrum for plant growth (PAR, and then mainly blue and red wavelengths)…
…or both. In any case, the light is of a slightly better quality, which will result in a more potent yield than the budget lights in this list (the amount of watts kept the same).
The LED chips used in this light are 3W Epistar and Bridglux chips. When purely looking at it from a chip-quality-perspective, these lights aren’t any better than the budget-lights in this list…
But when we look at the PPFD-readings at the center, you can see they’re slightly higher.
But here’s the kicker:
You now know that a single center PPFD reading is absolutely useless! But the grow journals don’t lie, this light does seem to put out slightly stronger light.
These lights also run slightly cooler than budget lights like the MarsHydro Mars Pro II Epistar or VIPARSPECTRA Reflector series…which is great for longevity.
And last but not least:
You get a 5-year warranty, which is superb in this industry.
The only downside…
They’re priced as high as the premium lights in this list, while being only ‘slightly better’ than the budget-lights.
The bottom line is:
Build quality-wise and light intensity-wise, the Advanced Platinum Series are a step up compared to the budget-lights in this list…
But, they’re also just as expensive as the premium lights in this list…while their quality is worse.
I do feel this light is overpriced.
The popularity and impressive record throughout the years still give this light the last spot in our list
- Click to see most recent price – (Amazon)
A word about the origin of these lights…
According to their website, the LED diodes in this light are 100% American made…which is rare for LED lights.
And this could be enough reason for some of you to pick these LED lights over the MarsHydro or VIPARSPECTRA lights.
Most LED lights are manufactured in China.
China doesn’t have the best reputation in terms of quality control…
There are plenty of horror stories about low quality Chinese LED lights biting the dust after just a few weeks of use…
Western countries simply do have a better reputation in terms of quality control.
And the 5-year warranty you get with these lights really prove they trust their own craftsmanship as well.
Plus, their customer service has raving fans all over.
But I really doubt the whole light is manufactured in the U.S. If I would have to take a guess it’s only the diodes that are.
LED Light Accessories
Most lights come with a hanging kit.
But if not, you will need a way to hang your lights.
And the best way to do that is with some quality:
- Rope Ratchets – (Amazon)
These rope ratchets are sturdy as hell.
But again, most lights come with their own hanging kit!
If you want to make things easy on yourself, you should also get a timer to control your light cycles:
- Honeywell Timer – (Amazon)
Othersie you’ll have manually turn on/off your lights, which is a hassle, trust me.
One Last Word…
You don’t have to go for a premade LED light.
If you’re tech-savvy you could build your own LED kit.
There are many guides and tutorials on the web, which will show you how to build a very powerful LED light that will be quite a bit cheaper than the premium premade LED lights, but will provide close to the same quality of light.