Precision lighting engineered for growers who demand flexibility without compromise. The Fluence RAY44 is a 44-inch LED grow light bar that delivers targeted, high-efficiency photons exactly where your plants need them — whether you're running a vertical farm, research facility, greenhouse, or intracanopy setup. With six spectral options and a slim, modular form factor, the RAY44 adapts to your crop, not the other way around.
Why Fluence RAY44
The RAY44 stands apart from conventional grow bars because it was purpose-built for precision cultivation environments. Unlike broad-coverage fixtures that waste light on walls and floors, the RAY44's 120-degree beam angle concentrates photons directly on the canopy, maximizing your photon use efficiency (PUE) and your return on investment. Available in six distinct spectral compositions — from broad-spectrum PhysioSpec to targeted UVSpec and AnthoSpec — it gives growers the ability to dial in the exact light recipe for each crop stage or research protocol.
Growers choose the RAY44 because it works equally well as a standalone sole-source fixture or as a supplement to larger systems like the SPYDR or VYPR. Its 0-10V dimming capability and compatibility with Fluence's light intensity Dimmer give you precise PPFD control at every stage of the plant lifecycle — from propagation through harvest.
Key Benefits
- Six Spectral Options – Choose from PhysioSpec Indoor, PhysioSpec Greenhouse, AnthoSpec, PfrSpec, PrSpec, or UVSpec to match your exact crop and growth-stage requirements.
- High Photon Efficacy – Achieves up to 2.2 μmol/J electrical efficiency, delivering more usable light per watt consumed.
- 120° Beam Angle – Concentrates light on the canopy for close-proximity cultivation, reducing floor loss and improving canopy penetration.
- 0-10V Dimmable – Provides precise PPFD control across all growth stages without changing fixtures.
- UL-Rated for Damp Locations – Safe for humid greenhouse and indoor growing environments.
- Slim, Modular Form Factor – At 44 inches long, it fits seamlessly into vertical racks, side-canopy arrays, and intracanopy configurations.
- Plug-and-Play Ready – Comes complete with power supply and all mounting hardware for immediate deployment.
- Wide Operating Temperature Range – Rated from -40°C to 35°C (suspended), making it suitable for cold storage, controlled environments, and warm greenhouses alike.
Use Cases
- Vertical Farms – Ideal for rack-mounted, close-proximity lighting in multi-tier growing systems where slim profile and uniform PPFD are critical.
- Research Facilities – Six spectral options allow scientists to isolate specific wavelength effects on plant morphology, yield, and secondary metabolite production.
- Side-Canopy & Intracanopy Lighting – Penetrates dense canopies to deliver light to lower bud sites, improving overall yield and quality in tall crops.
- Greenhouse Supplemental Lighting – Pairs with natural sunlight to extend photoperiods or compensate for low-light seasons, especially with PhysioSpec Greenhouse spectrum.
- Propagation & Clone Rooms – Dimmable output and targeted spectrum support healthy rooting and early vegetative development.
- Specialty Crop Production – AnthoSpec and UVSpec options support anthocyanin development and UV-triggered responses in herbs, leafy greens, and cannabis.
Directions for Use
- Mount the RAY44 at close proximity to the canopy using the included hardware; the 120° beam angle is optimized for near-canopy placement.
- Connect to a compatible 0-10V dimmer or controller for precise PPFD adjustment.
- Ensure a minimum of 1 ft³/s of airflow around the fixture for efficient thermal management and extended system lifetime.
- Operate in ambient temperatures between -40°C (-40°F) and 35°C (95°F) when suspended, or up to 30°C (86°F) when surface mounted.
- Combine multiple RAY44 units in a side-by-side array to achieve uniform coverage over a 4-foot growing area.
- Use with the Fluence light intensity Dimmer for instant PPFD adjustments when transitioning between crop varieties or growth stages.
Specifications / Guaranteed Analysis
- Fixture Length: 44 inches (RAY44)
- Beam Angle: 120°
- Dimming: 0-10V
- Certifications: UL-rated for damp locations
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PPF Output by Spectrum:
- PhysioSpec Indoor: 190 μmol/s
- PhysioSpec Greenhouse: 190 μmol/s
- AnthoSpec: 190 μmol/s
- PfrSpec: 126 μmol/s
- PrSpec: 200 μmol/s
- UVSpec: 108 μmol/s
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Power Consumption by Spectrum:
- PhysioSpec Indoor: 85W
- PhysioSpec Greenhouse: 85W
- AnthoSpec: 88W
- Electrical Efficiency: 2.2 μmol/J (PhysioSpec Indoor, Greenhouse, AnthoSpec)
- Weight: 2 lbs
- Dimensions: 22L x 2.2W x 1.4H in
- Operating Temperature: -40°C to 35°C (suspended); up to 30°C (surface mounted)
- Includes: Power supply and all mounting hardware
What Growers Are Saying
"The RAY44 transformed our vertical farm operation. The spectral flexibility alone is worth the investment — we switched from PhysioSpec to AnthoSpec mid-cycle and saw a noticeable improvement in color development."
— Marcus T., Commercial Vertical Farm Grower
"We've been running RAY44s as intracanopy lights in our greenhouse for two seasons now. Easy to install, runs cool, and the yields speak for themselves."
— Sarah P., Greenhouse Grower
"As a research facility, we need precise spectral control. The six spectrum options on the RAY44 give us the flexibility to run multiple protocols simultaneously without buying different fixtures."
— Daniel R., Plant Research Scientist
Frequently Asked Questions
What is the difference between the six spectral options?
Each spectrum is tuned for a specific application: PhysioSpec Indoor and Greenhouse are broad-spectrum options optimized for full-cycle plant growth; AnthoSpec promotes anthocyanin and pigment development; PfrSpec targets far-red wavelengths for photoperiod control and stem elongation; PrSpec delivers red-dominant output for high photosynthetic efficiency; and UVSpec provides UV wavelengths to trigger stress responses and secondary metabolite production.
Can the RAY44 be used as a sole-source light?
Yes. The RAY44 is designed to function as a complete sole-source lighting solution, particularly in vertical farms and indoor grow rooms. It can also be used as a supplement to larger fixtures like the Fluence SPYDR or VYPR.
Is the RAY44 compatible with third-party dimmers and controllers?
The RAY44 supports standard 0-10V dimming and is compatible with most 0-10V controllers. Fluence also offers its own light intensity Dimmer for seamless integration and precise PPFD control.
How should the RAY44 be stored when not in use?
Store in a dry, temperature-controlled environment. The fixture is UL-rated for damp locations during operation but should be kept away from standing water or condensation during storage.
What results can I expect compared to HPS or T5 fixtures?
Growers typically see improved energy efficiency (up to 2.2 μmol/J vs. ~1.7 μmol/J for HPS), reduced heat load, and the ability to place lights closer to the canopy without heat stress — all of which contribute to faster growth cycles and improved crop quality.
What is the current lead time for the RAY44?
Current lead time is approximately 45–60 days from payment received. Fluence is actively ramping manufacturing capacity to meet demand without compromising quality.
More about Fluence - RAY44:
Versatility for any growing environment.
Perfect as a sole-source lighting solution, or as supplement to SPYDR/VYPR.
Utility player.
The Fluence RAY LED grow light bar is available in three sizes: 22″, 44″ and 66″, and it is available with six different spectral compositions for full-cycle growth and supplemental photomorphogenic response. The Fluence RAY comes with a 120-degree beam angle for close-proximity cultivation, which minimizes the amount of light on the floor, thus maximizes your growth rate and your ROI.
The LED grow light bars are UL-rated for damp locations and are 0-10V dimmable, so you can achieve the amount of PAR your plants need at each stage of their lifecycle. Each fixture comes with the power supply and everything you need to immediately use the lighting system over your crop.
All RAY models are dimmable with our light intensity Dimmer for precise control over PPFD, and offer the flexibility to instantly accommodate a new crop with varying light requirements.
RAY44
At 44″ long, our mid-length RAY44 offers six spectral choices and is perfect for side canopy lighting over a 4-foot area.
Spectrum Options:
PhysioSpec Indoor
PhysioSpec Greenhouse
AnthoSpec
PPF:
PhysioSpec Indoor: 190 μmol/s
PhysioSpec Greenhouse: 190 μmol/s
AnthoSpec: 190 μmol/s
PfrSpec: 126 μmol/s
PrSpec: 200 μmol/s
UVSpec: 108 μmol/s
Power:
PhysioSpec Indoor: 85W
PhysioSpec Greenhouse: 85W
AnthoSpec: 88W
Electrical:
PhysioSpec Indoor: 2.2 μmol/J
PhysioSpec Greenhouse: 2.2 μmol/J
AnthoSpec: 2.2 μmol/J
Weight (lbs): 2
See more information about Fluence PhysioSpec spectra.
Current lead time projection is 45-60 days from payment received. We are experiencing high volume and ramping our manufacturing as quickly as possible without sacrificing quality.
Suitable for operation in still air ambient temperatures from -40°C (-40°F) to 35°C (95°F) when suspended and up to 30°C (86°F) when surface mounted. Operating temperature ranges between 25°C (77°F) to 30°C (86°F) above ambient.
We recommend at least one ft3/S of airflow to ensure efficient cooling. Proper air flow will also increase the maximum suitable operating temperature and help extend lifetime of system.
Dimensions:
22L x 2.2W x 1.4H in
Weight:
1 lb