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Fohse A3i, the Best Grow Lights in the Market

1500W Industrial LED Grow Light

Designed for unbelievable yields in high bay, single level environments.
Patent pending.

More info Spec Sheet

The labcoats are triple checking their work. Check back later for this data.


Big Things Have Small Beginnings

The power of A3i starts with thousands of diodes from industry leading diode manufacturers.
PPF: 4,231 μmol/s (Options up to)
PPE: 2.65 - 2.82 μmol/J (Options up to)
DLC 3rd party listing
Accomplish More With Less

Because of its unprecedented power output and industry-leading coverage area, an A3i system will always require less fixtures to produce similar (or better) light levels as an HPS system or LED system of similar size. Depending on your goals you can opt to use less fixtures to produce the light levels you’re accustomed to, or you can ‘fill the grid’ with A3i luminaires and join the growing movement of pioneers setting harvest records under high-intensity lighting environments.

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This is Unprecedented Canopy Penetration in Commercial LED Grow Lights

Early generation LEDs failed the cannabis industry due to low output + poor canopy penetration. The A3i is the most powerful, efficient and overall best grow light in the world. Swiveling light bars achieve maximum canopy penetration via cross illumination to neighboring grow plots.
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 A3i system over time.

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Never Buy Another Bulb Again for Cannabis Plant Growth

How much would you save if your grow never had to replace another bulb? Maintaining an HPS system is a burden to your bottom line due to:
  • Labor costs
  • Hazardous waste fees
  • Tedious cleaning
  • The cost of the bulbs themselves
  • The inevitable replacement of worn out ballasts

Over time that burden will far outweigh the low cost of an HPS system. Eliminate the burden entirely by switching to Fohse LED, the best grow lights for cannabis. Buy right, buy once .
L90: 39,000 hours (Based on diode manufacturer specs)
L70: 110,000 hours (Based on diode manufacturer specs)
Bulbs Die Suddenly.
LEDs slowly fade.

To put the L70 of the A3i into perspective, after 110,000 hours of use the fixture's output will have diminished to 2,940 umol/s, which is still 47% MORE POWERFUL than a fresh-out-the-box 1000W DE HPS bulb. And just how long is 110,000 hours? If you run 12/12 cycles every day that's 9,166 days ... 1,309 weeks ... 301 months ... 25.1 years of runtime and your system will still outperform an HPS system.

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Innovative Heat Management in Commercial LED Grow Lights

Cooling a traditional HPS setup can be costly, especially when putting more light into the environment. The A3i produces 60% more light per BTU than an HPS system, significantly reducing the strain on your cooling systems.
Passively cooled
Thermally-conductive aircraft grade aluminum
16,416 in2 (Heat-dissipating surface area)
Make a Friend
Out of Heat

Unlike obsolete plasma grow lights the A3i has no massive 'infrared spike' hidden on the far ends of its spectrum, meaning drastically less heat radiating down on your canopy.

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 radiative 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 A3i!

Less AC Higher Harvest Quality

More cannabinoids and better terpene profiles means you'll enjoy some of your best harvests yet with the A3i.

The labcoats are triple checking their work. Check back later for this data.

Unrivaled Efficacy

The A3i is capable of some of the best photosynthetic photon efficacy figures of any LED grow light for cannabis in the world. Its secret? An abundance of diodes so no diode is 'overclocked', as well as our patent-pending thermal management. Cool diodes are efficient diodes. With the A3i, you get the most efficient and the best grow light system in the market.
PPE: 2.65 - 2.82 μmol/J (Options up to)
DLC 3rd party listing
More Light, or Smaller Bills?

When you equip your facility with the most powerful AND efficient LED grow light available you have two paths forward available. First, you can configure your A3i system to maintain the light levels you’re used to, and thanks to the A3i's top-rated efficacy you'll produce that light at rockbottom prices. Second, you can configure your A3i system to maintain the electrical expenditures you’re used to, and with the A3i’s sky high efficacy that means you’ll produce far more light per watt than you’ve ever seen. Just wait and see what’s possible win a high-intensity light environment. Click here for a glimpse.

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Safe to Handle. No More Burns with Commercial LED Grow Lights.

It's no secret that the heat from typical HPS grow lamps is a safety hazard. At full power the A3i is about as hot as a sink full of dish water.
Average Surfrace Temperature: 115°F  /  46°C
Heat Transfer

How does the A3i 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.

Your grow environment isn’t the friendliest place for sensitive electronics. That’s why the A3i grow lights for cannabis can withstand the intense conditions of your grow. It’s impervious to hitchhikers (dust, mites, aphids, spores). It can even withstand full submersion in 1 meter of water.
Ingress Protection Rating: IP67
Ingress Protection

Ingress Protection testing really puts our fixtures through the ringer : sandblasting, water spray, pressure washing, submersion, etc. Rest assured your A3i 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
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Power Surges? We're Ready

The A3i is a commercial LED grow light that comes twice-protected from electrical overload scenarios. Thrice-protected if you count our 5-year conditional warranty.
Power surge protector
Lightning surge protector

Everything Culminates Here...

The A3i is designed to grow cannabis. Its spectral distribution output is tailored to suit the unique demands of the plant. Easily switch between spring, summer, and autumn modes as your crops mature through their life cycle. With the A3i, you truly get the best grow light for cannabis.
3 Spectral Distribution Modes
Custom integration options available
Wall-Mounted Network Control

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.
Swiveling heatsinks for custom footprints
Sunset, sunrise, and manual dimming
Network control for one-touch adjustments
Custom integration option available

Seeing Is Believing.

Other light brands boast about being the best.
We won’t just tell you we’re the best grow light manufacturer. We’ll prove it.
Contact us today for a custom light plan.
Contact us today
Full Technical Specs