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Aries Aries PRO
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The Aries PRO by FOHSE

640W Aries PRO LED Grow Light.

Our most powerful and efficient full-spectrum commercial LED grow light, now re-imagined with 7 tunable channels and a smaller footprint.

More info Spec Sheet

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Your Requests, Our Solutions: FOHSE Delivers

Meet the Demand: The Fohse Aries PRO 640W fixture answers the call for powerful and efficient solutions, that allows for customizable spectrum control, in smaller footprint settings.
? supplement CO2 supplement CO2
PPF: 1,755 μmol/s (Options up to)
PPE: 2.6-2.8 μmol/J (Options up to)
DLC 3rd party listing
PPE & Grow Light Efficiency

You’ll notice we post the efficacy performance of the Aries PRO as a range. These figures represent the top and bottom ends of how well your Aries PRO unit will convert electricity to usable photons. LEDs tend to operate more efficiently when operating below maximum output. The lowest PPE figure is representative of running the Aries PRO at full power in the ‘Spring’ spectrum, while the highest figure is representative of running the Aries PRO at 50% output in the ‘Autumn’ spectrum.

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Maxamize Canopy Penetration

Early generation LED lamps failed the cannabis industry due to low output + poor canopy penetration. The secret of the Aries PRO success starts with abundant PAR focused onto your canopy by polycarbonate focal lenses. Next, the Aries PRO LED grow light deploys an advantage you won't find anywhere else—swiveling light bars to achieve maximum canopy penetration by cross illumination to neighboring grow plots.
? How much light is too much? How much light is too much?
View: PPFD Maps (Actual & Simulated)
Polycarbonate Lenses 120° (Options up to)
Precision Light Planning

If there's one thing we've learned touring close to a thousand cultivation facilities around the world, it's that every environment is unique with its own special requirements. When you work with Fohse, our partnership kicks off with a thourough review of your grow room plans and your goals. Our light planning team heads into our simulation software to develop a 100% custom configuration tailor-fit to the unique needs of your operation. We can even take it a step further and predict your cost of cooling, cost of electricity, and how much you'll save owing an Aries PRO system over time.

Get Your Light Plan
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Ultimate control over your lighting capabilities.

The first of it's kind, unlock your plants true potential with full spectrum tunability. The Aries Pro has upgraded tunability consisting of 7 isolated spectrum channels including: UVA, green, far red and more providing customizable brightness and spectral output throughout the growth cycle.
? Spectral Output CHARTS Spectral Output CHARTS
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7 Channel Adjustable Spectrum Capabilities
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Custom integration options available
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Wall-Mounted Network Control
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End expensive bulb replacment, for good.

Let’s be honest - bulb-style grow lights are a hazard. Burns, waste, breakage ... why subject your passion for growing to these hazards when a better option, like the Aries PRO is available?
? When to replace your Aries PRO? When to replace your Aries PRO?
L90: 50,000 hours (Based on diode manufacturer specs)
Bulbs Die Suddenly.
LEDs slowly fade.

Our L90 and L70 figures come straight from the data sheets and stress-testing provided by our diode manufacturers. To put the L90 of the Aries PRO into perspective, after 50,000 hours of use the fixture’s output will have diminished to 1,613 μmol/s, which is still better than the output of every other LED grow light in the same class as the Aries PRO. And just how long is 50,000 hours? If you run 12/12 cycles every day that’s 4,166 days ... 595 weeks ... 136 months ... 11.4 years of runtime and your system will still outperform every other comparable LED grow light out there. (and of course all those bulb changes you’ve eliminated)

GET YOUR Aries PRO LIGHT PLAN
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Make a Friend Out of Heat

Unlike obsolete plasma burning grow lights, the Aries PRO has no ‘Infrared Spike’ in its spectrum, meaning drastically less heat radiating down on and damaging your canopy.
? HID's Dirty Secret
The IR Spike HID's Dirty Secret
The IR Spike
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Passively cooled
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Thermally-conductive aircraft grade aluminum
7,200 in2 (Heat-dissipating surface area)
Is Heat Harming Your Crop?

There’s no way around it: the ‘infrared spike’ with HID grow lights is damaging to your crop. While harm reduction methods do exists, you can eliminate it entirely by switching to the Aries by Fohse.

Less AC Less AC

Without the IR spike cooking your upper canopy, you’ll need far less cooling to compensate in order to keep your LSTs in an optimal range.

Less AC Even Warmth

A reduction in radiate heat and chilled air compensation makes for a much more even LST temperature throughout your upper to lower canopy.

Less AC More Bud Growth

An even canopy LST temperature promotes more RuBisCO reactions down your canopy, leading to more instra-canopy bud development.

Less AC More Cannabinoids

Cannabinoids are heat-sensitive. No more destructive IR spike means more cannabinoids make it to harvest.

Less AC More Terpenes

Terpenes are also heat-sensitive compounds and degrade at higher temperatures. Enjoy some of your best terp profiles ever with the Aries!

Less AC Higher Harvest Quality

More cannabinoids and better terpene profiles means you'll enjoy some of your best harvests yet with the Aries.

water sampling unit

Elevate Plant Health with Our 4-in-1 Integrated Sensor for Temperature, Humidity, CO2, and PPFD Optimization


Empower Your Cannabis Cultivation: Gain real-time insights into temperature, humidity, CO2 levels, and PPFD with FOHSE's cutting-edge 4-in-1 Integrated Sensor. Fine tune growing conditions for maximum yields and quality. Seamlessly integrated with our PRO Controller, achieve unprecedented precision and control in indoor cultivation.
Average Surfrace Temperature: 115°F  /  46°C
Heat Transfer

How does the Aries PRO generate so much power yet remain relatively cool to the touch? The secret is in the engineering advantage harnessing the principles of conductive and convective heat transfer. We’ve packed over 16,000-in2 of surface area into the A3i’s custom heat sinks. This effectively dilutes and disippates any heat across all that surface area via conductive heat transfer. This makes it much easier for the normal ambient airflow to wick that heat away from the fixture via convective heat transfer where it can be easily shuttled out of your grow environment.

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Dustproof. Watertight. Safe to Handle.

Designed to brave the toughest grow environments: The Aries PRO is built to endure intense conditions, resisting dust and moisture. This fixture is also able to withstand full submersion in 1 meter of water for unmatched reliability. Simultaneously, our PRO fixtures have a low operating temperature to allow for increased longevity and lower failure rates.
Ingress Protection Rating: IP66

Ingress Protection

Ingress Protection testing really puts our fixtures through the ringer : sandblasting, water spray, pressure washing, submersion, etc. Rest assured your Aries PRO is well-protected from the hazards of your grow environment.

Dust intrusion protection

Impervious to small particulates 6/6

Liquid intrusion protection

Can withstand 1 meter submersion for 30 minutes 7/8
GET YOUR Aries PRO LIGHT PLAN

Easily Integrate With Your Environment

Installation is simple and the learning curve with high-quality LED is short. If you’ve never cultivated under high-intensity light levels, we have a long list of cultivation experts who have had success with our fixtures standing by to coach you and your team to incredible harvests.



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Grow Like a Pro. Shop Fohse.

Other light brands boast about being the best. We won’t just tell you we’re the best. We’ll prove it.
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Full Technical Specs

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Frequently Asked Questions

  • My Aries PRO fixture isn't functioning properly. What should I do?

  • What is the light footprint?

    The Aries PRO LED grow light is best suited for a standard 4×4 plot. Feel free to use your favorite PPFD meter to play around with the fixture’s swiveling light bars to come up with your own custom footprints.

  • What is the recommended height / canopy distance?

    We recommend finishing your flower 3-feet away from the fixture at full power on the ‘Autumn’ spectrum setting, but this variable is strain-specific and also influenced on the rest of your environment parameters (grow medium, watering method, nutrient delivery method, cooling capability, etc). The Aries PRO was designed to give you control over your light levels without ever having to adjust the height throughout your grow cycle, but at the end of the day we recommend using your favorite PPFD meter to dial in your perfect height.

  • Can the Aries PRO be used in a vertical setting?

    It sure can. You can use your Central Control unit to set light levels anywhere between 30% and 100% output. Using your preferred PPFD meter you’ll be able to dial in the perfect light level to suit your vertical environment.

  • What is the plug type?

    Type B, 3-pin plug. If you live in a part of the world with different socket types, we recommend picking up a plug converter from your local hardware store.

  • Can it go in a 4x4 tent?

    Absolutely! In fact, we recommend reflective walls for any size grow plot to help reduce the light-dissipating effect of the Inverse Square Law

  • What voltage can the Aries PRO run on?

    The current configuration of the Aries PRO is made to operate on standard 110V. It can be ran up to 277V, but that would require a DIY swap for a different plug which would void the fixture’s warranty.

  • How many amps does it use?

    5.82 Amps. (640W ÷ 110V = 5.82 Amps)

  • How should I hang the fixture?

    Hanging instructions and hardware are included with each Aries PRO. You can download the instructions here, too.

  • How do I clean my Aries PRO fixture?

    We recommend spraying the your fixtures down with a 2% bleach-water solution and then rinsing down with a hose. The fixture is certified IP67 so rest assured it will be safe from any water intrusion following this cleaning protocol.

  • How many Aries PRO fixtures can I link to my Central Control unit?

    Up to 100.

  • Does the Aries PRO get hot?

    No hotter than a sinkfull of hot dishwater.

  • Is the Aries PRO passively cooled or actively cooled with a fan?

    The form factor of the Aries PRO will passively dissipate heat over thousands of square inches of surface area where it can easily be wicked away by your environment’s fans.

  • What is umol/J and why does it matter?

    It reads “micromoles per Joule” and is a measurement of how efficient a grow light is at converting watts to PAR photons, or its “photosynthetic photon efficacy” (PPE). Many shady manufacturers will mislead you by saying their light is capable of high PPE figures, but will leave out the fact they load the fixture up with red diodes which are more efficient than white or blue. The Aries PRO is currently the most efficient grow light out there with a Balanced Spectrum optimal for horticulture.

  • Do you sell/ship to my country?

    We currently ship all over the world.

  • What is your return policy?

    Our 3-year warranty covers manufacturing defects. Since grow lights depreciate with use, we cannot accept returns for any other reason. If you need to inquire about a warranty claim, please open the chat helper and indicate you’d like to open a support ticket. Our technicians will respond within 24 business hours to assist you.

  • How can I sign up to distribute Fohse products?

    We’re always looking for partners around the world to carry our state-of-the-art LED grow lights. Please fill out our contact form and indicate you are a distributor. A member from the Fohse team will respond within 24 business hours to assist you.

  • Why are some of the leaves on my plants twisting or bleaching?

    This could be a sign that your Aries PRO is powered up too high. Try dimming the light seeing if that corrects the issue. If not, you may have other issues to investigate such as watering or nutrient protocols.

  • Should I wear protective glasses when working under my Aries PRO?

    Yes, basic sunglasses will work. The Aries PRO is bright and frequent, repeated exposure without protection will strain your eyes.

  • Is it true that growing with LEDs requires slightly higher room temps than HID setups?

    In most cases, absolutely. HID bulbs have a huge spike in the infrared range (manufacturers conveniently stop their spectrum charts short of the IR range) that is traditionally handled with lower room temps. The Aries PRO does not have this inefficiency, so you’ll be able to dial back the cooling and let your room temp rise. We recommend using your preferred thermographic camera or similar instrument to ensure your leaf surface temperature (LST) is around the 82-85°F range. Any lower and photosynthesis will slow down.

  • After a power outage will my Aries PRO come back on?

    Once power comes back on the Aries PRO will return to whatever state it was in prior to the power outage.

  • Should I use a surge protector with my Aries PRO?

    The Aries PRO has two internal surge protection and line filter circuits already included inside so no surge protector is needed.

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Our Aries PRO model is the most powerful and efficient commercial LED grow light the world



Volume discounts apply. Price match guarantee.
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FOHSE is the world's leader in LED grow technology. Every light we manufacture includes patent pending technology that puts FOHSE ahead of our competition. We developed and manufactured the Aries PRO to include our patent pending LED technology that makes FOHSE the best grow lights for indoor plants. We aim to give every client the best price on the Aries PRO as possible while keeping the world leading power and efficiency for cannabis plant growth. When you contact our lighting experts they will identify every opportunity for cost savings on FOHSE Aries PRO grow lights – such as volume discounts – that will be passed along to you. Request a quote to get started.

Aries PRO Technical Specs

Please fill out the following form to download the full technical specs

CO 2 Requirements

Growing under high-intensity light conditions will require you to recalibrate every aspect of your environment, and chief among that is CO2! We advise all our clients to supplement at least 1200ppm of CO2 in their environment. Keep a close eye on your plants and take detailed notes every crop cycle to find the sweet spot. CO2 gives your crop the carbon building blocks they need to build biomass, and without an adequate amount it won’t matter how much light your system throws down.

How Much Light is Too Much?

When you manufacture the most powerful grow light in the world, this is a question we often get. The short answer is your plants will tell you. The deeper answer is, well, it depends on what other factors in your environment are limiting your crop from fully utilizing all available light - watering schedule? Leaf surface temperature? Ambient CO2? Genetics?
For our cannabis clients, the question is actually ‘How much light can cannabis take?’ The answer to that question is, we really don’t know (click the link to listen to Dr. Bruce Bugbee’s thoughts on the matter).
On of our clients in Michigan is really pushing their genetics to find out, and after setting back-to-back, record-breaking harvests all throughout 2020, they still haven’t found the top! Follow this link for a brief summary of their results over 40 harvests.

PPFD Maps

Spectrophotocolorimeter Report

Aries PRO Grow Light
PPF Degradation

1 "day" = 12 hours of use

The Infrared Spike

Ever notice how most spectral charts for grow lights stop around the far-red region? That's because extending the chart into the infrared region would show one of the biggest problems with plasma-burning light sources... an enormous spike of radiative heat!

Aries PRO Central Control Manual

Please fill out the following form to download the manual

Aries PRO Technical Specs

Please fill out the following form to download the full technical specs

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