Support | Answers to your Product Questions - Fluence
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Fluence Support

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  • What our products do, and how they do it.

What product do you recommend?

The determining factor for which product model is best for your operation is dependent upon your goals and environment. There are numerous variables that will determine which product is best for your growing environment. We have compiled a high-level summary below to help you decide.

Indoor? SPYDR and VYPR are ideal for indoor environments. If you have a vertical rack system, grow tent or aisles throughout your room, we recommend one SPYDRx for veg and SPYDRx PLUS for bloom for every 4’x4’ of canopy. If you have a wide-open room (i.e. sea of green) we recommend VYPRx and VYPRx PLUS. Light levels vary for VYPR depending on mounting height and spacing. Please contact us for a free lighting design consultation to determine the appropriate number and placement.

Greenhouse? VYPR was incepted from the ground up for a greenhouse environment. The exact number of fixtures and model is dependent on your geographic location, crop type and growth goals. Please contact us for a free lighting design consultation.

Do Fluence systems emit UV?

Our UVSpec PhysioSpec spectrum provides a peak wavelength of 400nm and is designed to provide beneficial photomorphogenic responses by creating a mild stress response in plants. As an example, research shows UV light can increase THC content in cannabis plants when applied during the last one to two weeks of growth.

When applied incorrectly, research shows UV stress causes photoinhibition of chloroplasts, resulting in lower biomass production, photobleaching and death of leaves.

UVSpec is available in our RAY systems.

What is the difference between PhysioSpec Indoor and PhysioSpec Greenhouse?

In a typical greenhouse environment, certain parts of the electromagnetic radiation emitted by the sun encourage plant characteristics that are undesirable, such as plant stretch induced by 730nm far red radiation. We counter these effects with an increase in 400-450nm composition in PhysioSpec Greenhouse™.

What is the SPYDRx and VYPRx products wattages?

SPYDRx consumes 330 watts and VYPRx consumes 320 watts. SPYDRx PLUS consumes 660 watts and VYPRx PLUS consumes 515 watts. Please keep in mind wattage is good for one thing: understanding your electrical input load (and ultimately electricity costs). Watts don’t grow plants, and watts/square foot really don’t grow plants. To better understand metrics for plant growth, see our science tab about PAR and PPFD.

Are Fluence systems passively cooled or actively cooled with a fan?

All Fluence systems are passively cooled using natural convection without the need for a fan. We do not believe in installing cooling fans inside LED fixtures. On average, LEDs should yield approximately 50,000 hours of useful life. However, no fan is going to last this long in wet/damp/harsh/dirty environments typical in horticulture environments. If the fan fails after 10,000 hours, the LEDs would fail shortly after. In addition, fans require energy to operate, and fans don’t grow plants. We prefer every joule of energy go toward photon emission. Hence, we do not believe this is an acceptable engineering design for LED fixtures.

Do your fixtures produce heat?

Yes, all lighting systems produce heat, but our systems dissipate the heat differently than other LED systems, fluorescent or HID (i.e. metal halide) lighting systems. Fluorescent and HID lighting systems largely rely on radiative heat transfer from the front side of the fixture. This is why you can feel the heat if you place your hand in front of these lighting systems. This is compounded by the aluminum reflectors that are commonly used in these systems, and this can have a substantial impact on the temperature at canopy level. Fluence systems rely on conduction and convection as the main heat transfer methods. This is why the heat sink on back of our fixtures will feel warm/hot. Since convection is carrying the heat away from the fixture from the top of the fixture, your canopy temperature will be minimally impacted compared to using a fluorescent and/or HID lighting system.

Do Fluence lights get hot?

This depends on the air temperature and air velocity around the fixture. If you have air flowing around the lights, they will barely feel warm. However, if the air surrounding the fixture is hot or there is very little air movement, the fixture will feel very hot. This is normal because the fixture housing draws heat away from the LEDs by design. However, these are high-power lighting systems, so we do not recommend touching them.

What plug type do you offer on your lighting systems?

All of our lighting systems ship standard with a NEMA 5-15P 3-prong plug – except VYPRx PLUS which ships standard with a NEMA 6-15P plug.

Upgrades are available to NEMA 6-15P, NEMA L7-15P or pigtails. Please select options at checkout.

What is μmol/J and why does it matter?

μmol/J stands for micromole per Joule. It is a measurement to determine how efficient a light is at converting electrons into photons. Fluence lighting systems are some of the most efficient on Earth. They are also some of the most powerful. It’s the balance between the two that we strive for real-world application. More on this later.

Will Fluence lighting systems work with my line voltage? What is the amperage?

Yes (most likely). See the following chart to determine whether a specific product will work with your input voltage, and its associated typical amperage.

Product Model Input Voltage Amps @ 120V Amps @ 208V Amps @ 240V Amps @ 277V Frequency
VYPRx 120V – 277V 2.8 1.6 1.4 1.2 50/60Hz
VYPRx PLUS 120V – 277V N/A 2.6 2.2 1.9 50/60Hz
SPYDRx 120V – 277V 2.8 1.6 1.4 1.2 50/60Hz
SPYDRx PLUS 120V – 277V 5.7 3.3 2.9 2.5 50/60Hz
  • The foundation to product development and deployment

What is CRI and is it important to the development of my plants?

A light’s color rendering index (CRI) is a quantitative measure of the ability of a light source to reveal the colors of various objects faithfully in comparison with an ideal light source (i.e. the sun). This value is not important to how a plant responds or photosynthesizes. Where CRI is important is how well you can tell the true color of something, for example a leaf that might be chlorotic (lacking green). When you have an ideal CRI it is easier to detect color variations that might be indicating poor plant health.

PhysioSpec has a CRI of 85. For comparison, HPS has a CRI of 25.

What is PAR?

Plants are photoautotrophs – using a narrow band of light between 400nm -700nm as a source of energy to make food molecules from carbon dioxide and water.

This process is photosynthesis (the most important chemical process on Earth). The only type of light which enables photosynthesis is defined as Photosynthetically Active Radiation (PAR): the narrow band of light between 400nm – 700nm.

Light outside of this range is not photosynthetically active and will not generate greater biomass for those seeking improved yield.

What is PPF?

An electronic light source converts electrons into photons. Lights for human vision measure output with lumens (measured in lux or footcandles). Lights for photobiological reactions measure output with photosynthetic photon flux (PPF). PPF tells us how much PAR a light source emits.

Where PPF measures total PAR output of a lighting system, PPFD measures how much of that light is delivered to a canopy.

What is PPFD?

Before light can be effective in a photochemical reaction (whether photosynthetic or photomorphogenic), it must first be absorbed.

Photosynthetic Photon Flux Density (PPFD) is the measurement of PAR delivered to a specific area. It is expressed as micromole-per-meter squared-per second (μmol/m2/s).

This is the only measurement that informs us of the amount of light being delivered to a crop which enables photosynthesis.

Fluence SPYDR and VYPR systems are designed specifically for PPFD, not PPF.

Client Support
  • Questions?Answers.

Do you sell/ship to my country?

Yes. Barring an embargo, we sell and offer shipping to almost every country; however, we do not currently accept international orders online.

Please contact us at for a quote and order fulfillment.

For quick processing, tell us what product you would like to purchase and include your mailing address.

What is your return policy?

Since all lighting systems depreciate with use (including the sun), we do not accept returns or exchanges on any lighting products. We do offer a warranty guaranteeing our products for three years: click here to see our warranty policy.

How do I submit a warranty claim?

How long does it take to build and ship a product?

Current lead time projections are below. These estimates are based on non-commercial volume orders. Please contact us for lead time on orders greater than 60 units.

SPYDRx: 45-60 days from payment approval

SPYDRx PLUS: 45-60 days from payment approval

VYPRx: 45-60 days from payment approval

VYPRx PLUS: 45-60 days from payment approval

RAZRx: 45-60 days from payment approval

RAY: 45-60 days from payment approval

Dimmer: 45-60 days from payment approval

Do you offer financing?

Fluence does not currently offer internal financing options, however, we welcome the opportunity to work directly with your financial provider.

How can I sign up to distribute Fluence solutions?

Fluence purposefully sells direct to our end customers and does not work with third-party distributors. The only exception is our hydroshop channel which operate brick-and-mortal retail locations. If you are a hydroshop interested in becoming an authorized reseller, please click here to email us.

How do I clean my Fluence fixture(s)?

SPYDR Series

SPYDR Series 2 User Manual

SPYDR Series 2 Mounting Instructions

SPYDR 2i Spec Sheet

SPYDR 2i EU Spec Sheet

SPYDR 2p Spec Sheet

SPYDR 2p EU Spec Sheet

SPYDR 2x Spec Sheet

SPYDR Series 1 User Manual

SPYDR Series 1 Mounting Instructions

SPYDRx PLUS Spec Sheet

SPYDRx Spec Sheet

VYPR Series

VYPR 2 Series User Manual

VYPR 2 Series Mounting Guide

VYPR 2P Spec Sheet

VYPR 2P EU Spec Sheet

VYPR 2x Spec Sheet

VYPR Series User Guide

VYPRx PLUS Spec Sheet

VYPRx Spec Sheet

RAZR Series

RAZRx Series User Guide

RAZR user guide

RAZRx Spec Sheet

RAZR2, RAZR3, RAZR4 Series User Guide

RAZR2, RAZR3, RAZR4 Installation Guide

RAZR2, RAZR3, RAZR4 Spec Sheet

RAY Series

RAY Series User Guide

RAY Series Mounting Instructions

RAY Spec Sheet


Dimmer User Manual

Dimmer Multiple Fixture Wiring Guide

Dimmer Spec Sheet

Fluence LED grow lights
Store Support
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