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Fohse A3i 1500W LED

Out of stock
The power of the A3i starts with thousands of diodes from industry leading diode manufacturers. An A3i system will require half the number of fixtures to produce the same amount of light as an HPS system. In other words, the coverage of one A3i will still produce more light than two 1000W DE HPS lamps.

Fohse A3i 1500W LED

Current processing time 5-7 days

High voltage option available. Please call us at (707) 588-8844 for more information.

1500W Industrial LED Grow Light

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

Big Things Have Small Beginnings

The power of the A3i starts with thousands of diodes from industry leading diode manufacturers.

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.

This Is Unprecedented Canopy Penetration

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

Never Buy Another Bulb Again

How much would you save if your grow never had to replace another bulb? Between labor costs, hazardous waste fees, and the cost of the bulbs themselves, maintaining an HPS system is a burden to your bottom line. Eliminate the burden entirely by switching to Fohse LED.

Bulbs Die Suddenly, LEDs Fade Away

Fohse's L90 and L70 figures come straight from the data sheets and stress-testing provided by our diode manufacturers. To put the L70 of the A3i into perspective, after switching to Fohse LED. Buy right, buy once. 110,000 hours of use the fixture’s output will have diminished to 3,360 μmol/s, which is still 68% 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 by almost double.

Innovative Heat Management

Cooling a traditional HPS setup can be costly, especially when putting more light into the environment. The A3i produces far 60% more light per BTU than an HPS system, significantly reducing the strain on your cooling systems.

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.


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


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


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


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


Terpenes are also heat-sensitive compounds and degrade at higher temperatures. Enjoy some of your best terp profiles ever with the A3i!


More cannabinoids and better terpene profiles mean you'll enjoy some of your best harvest yet wit the A3i

Unrivaled Efficacy

The A3i is capable of some of the best photosynthetic photon efficacy figures of any LED grow light 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.

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 rock-bottom 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.

Safe to Handle; No More Burns

It’s no secret that the heat from typical grow lamps is a safety hazard. At full power the A3i is about as hot as a sink full of dish water.

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. Fohse packed over 16,000-in2 of surface area into the A3i’s custom heat sinks. This effectively dilutes and dissipates 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.

Dustproof; Watertight

Your grow environment isn’t the friendliest place for sensitive electronics. That’s why the A3i can withstand the intense conditions of your grow. It’s impervious to dust, mites, aphids, and spores. It can even withstand full submersion in 1 meter of water.

Ingress Protection

Ingress Protection testing really puts Fohse 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.

Power Surges? You're Ready

The A3i comes twice-protected from electrical overload scenarios. Thrice-protected if you count our 5-year conditional warranty.

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.

Easily Integrate with Your Environment

Installation is simple and the learning curve is short thanks to a standard level of features.


  • PPF: 4,800 μmol/s (options up to)
  • PPE: 3.4 μmol/J (options up to)
  • Polycarbonate Lenses: 120 ° (options up to)
  • L90: 50,000hrs A3i LED Longevity
  • L70: 110,000hrs A3i LED Longevity
  • Passively cooled
  • Thermally-conductive aircraft grade aluminum
  • 16,416in² Heat-dissipating surface area
  • 115°F (46°C) Average surface temperature
  • IP67 rated
  • Power surge and lightning surge protectors
  • 3 Spectral Distribution Modes
  • Custom integration options available
  • Wall-Mounted Network Control
  • Swiveling heatsinks for custom footprints & lateral illumination
  • Sunrise, sunset, and manual dimming
  • Interconnectivity for one-touch adjustments
  • Custom integration options available
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SKU gl_led_130