Lumens vs PAR

Lumens are measured for human vision while PAR is a measurement for plant growth (photosynthetically active radiation). Here is why that's important. 
Lumens vs PAR

The SpotOn Quantum PAR Meter Displays PAR in umols/ms. 

How Lumens Compare to PAR.

Lumens are for humans and PAR is for plants. The two don't have much to do with one another.

We made this short video that explains the differences. Or, read plese on...

Lumen is a measurement of human eyes ability to perceive the brightness emitted by any light source, and its measured in foot candles or LUX. 

By contrast, PAR (photosynthetic active radiation) is light energy measured in quantum photon flux which plants "see" to photosynthesize.

Because PAR is a quantum measurement and it cannot be easily converted to LUX.  Different color wavelengths of light travel at very slightly different speeds, so a complex quantum equation is applied to each wavelength to provide us with PAR. 

PAR is the total amount of energy in 400-700nm wavelengths of energy emitted by our sun, which is associated with optimal plant photosythesis. 

LUX is the total brightness of a light source, which is associated with what our eyes perceive. They are each their own interpretation of the photons of light. One for plants and one for us. The higher the LUX level the brighter the light source is to our eyes.

PAR is the spectrum that plants absorb or perceive. The higher the PAR the more intense the light source is for the plants. 

Can LUX meters be used to measure PAR? The short answer is no. They can be used for an approximate measurement of full-spectrum white light and a simple equation can be applied to give you a general comparison to PAR. However lights that contain more blue energy or more red energy will throw off this calculation significantly. 

See the SpotOn Quantum PAR meter 

PAR is measured with a specialized quantum sensor. Companies like Everfine, Licor, Apogee Instruments and Innoquest SpotOn all produce high quality quantum PAR meters and sensors.  

These sensors display PAR in PPFD or photosynthetic photon flux density. When you hear that someone grows at 1000 umols/ms this means their PAR level is 1000 PPFD. 

PAR levels change over distance from artificial sunlight being measured. If you increase the distance from the light fixture, PPFD will drop dramatically and exponentially. This is because an artificial light source produces a limited amount of photons as compared to the sun. PAR typically drops by 50% for every 12" of distance away from an artificial light source. And there is no standard that grow light makers use to measure PAR.

There is a standard used in lighting laboratory measurements called PPF (photosynthetic photon flux ) which is the total amount of photosynthetic energy a light outputs. But this measurement does not accurately predict PAR levels at the distance where your plants are from the grow light. This is because of the size of the light and how close all the diodes are to one-another. A 600 watt grow light that is 4’ x 4’ in size as compared to a 600 watt grow light that us 5’ long by 6” wide will have very different PAR measurements over different distances from the light, but could have the same rated PPF output. 

Plants in the flowering stage of growth do best between 800-1000 PPFD, and can be succesful up to 1500 PPFD depending on the grow environment and available CO2 levels. If supplemental C02 is added to the grow area plants can tolerate higher levels of PAR. Veg plants on the other hand prefer light levels between 250-400 PPFD. And clones and baby seedlings can't tolerate much more than 100 PPFD. 

An additional consideration in lighting layout for grow is what is called crossover. This is the area between two light sources where the light from each source crosses over. These are the photons that shoot at an angle and are still beneficial to the plants. Crossover is an important consideration and can significantly improve PPFD levels. Lighting layout that considers the distance between fixtures based on the amount of PPFD each light can produce allows light loss to be recaptured creating less wasted photons and more beneficial light for your plants. 

There are many different types of grow lights in the market today. Some are better than others at distributing energy evenly. 

As always, any questions you have about this or any other blog you see here, please contact us at shop@forevergreenindoors.com and we are happy to help you!

 

 

 

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Hortibest H8 720 Watt FSG 2.7 umols/j PPF 1944 umols/s Osram Diodes
MH8 720 Watt Full Spectrum LED Grow Light. Industry leading 1944 PPF, 2.7 umols/j. Osram diodes. DLC Listed. $ 795.00
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FGI Uniformity Pro Flex Smart LED Grow Light Wireless Connectivity
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660W Full Spectrum LED Grow Light. Linear Greenhouse or Ceiling Top Light. $ 649.95
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FGI MH8 Full Spectrum 660W LED Grow Light 2.6 umols/j 1716 PPF. Osram Diodes. DLC Listed.
FGI MH8 Full Spectrum 660W LED Grow Light 2.6 umols/j 1716 PPF. Osram Diodes. DLC Listed. $ 645.00
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The FGI Uniformity Pro 640 LED Grow Light
FGI Uniformity Pro 640w Full Spectrum LED Grow Light 1600ppf 4x4 Samsung+Inventronics $ 599.00
The Uniformity Pro 640 was designed to be the best built, longest lasting 4' x 4' LED on the market today. Fully water resistant wiring connections, heavy duty all aluminum bars, sealed crystal lens diode covers, in an easy to install folding frame. We use the highest quality and latest Samsung LM301B top bin diodes to create the FGI grow spectrum. The Uniformity Pro 640 is ideal for very high light intensity cultivation and is DLC approved for utility rebates in the US. We overbuild our lights intentionally so they will last for years and years in harsh grow environments. AT 37 lbs this unit is best in class for construction. Wet rated means it's okay to receive accidental over-spray. Suitable for vertical racks, over trays and benches or in 4' x 4' or larger grow tents. For use with the FGI Dimming Controller for light management and scheduling. Featuring  • All wiring connections are sealed with IP68 waterproof connections. • The LED diodes are covered with gorilla glass like crystal lens coverings. • Bars are heavy duty extruded aluminum. • 1600 umols/s total PPF output. • Nearly 1300 umols/ms of usable photosynthetic light output at 9-12".   Learn more about the FGI Uniformity Pro on our YouTube Channel here:  Our LED diode mix creates the ideal grow spectrum for indoor plants. 3200 full spectrum Samsung LM301B neutral white diodes in 4000K CCT. The white diodes are paired with 48 Osram Osolon Hyper Red Square 660nm diodes, from Osram's horticulture optimized LED diode line. Each light comes with a 10' power cord. It also comes with a 4' connection cable allowing you to control a network of lights with various lighting controllers. Our FGI Dimming Controller is one example and allows advanced programming including on/off timers, sunrise and sunset programming and automatically dims the light if temperatures in the grow space exceed your programmed limit. Par Map @ 12"   FGI Spectrum The Uniformity Pro 640 carries a full five year warranty. It's 5% larger than the Gavita 1700e and Fluence Spydr 2 series.  Specifications: Product Name: FGI HT-02 Uniformity Pro 640Part Number: FGIUP8Rev2UPN: 887437032817Dimensions: W x L x H (inches) 47x47x4 IMPORTANT: The unit does not ship with a standard plug. Please request a free 110/220/270V plug with your purchase if you need one. DiodesBrand Name: Samsung LM301B top binNumber of pieces: 3200Model/Part number: Neutral WhiteCCT: 4000KCRI: 80 Other color DiodesBrand Name: Osram OsolonNumber of pieces: 48Model/Part number: Hyper Red CCT: 660nmRatio mix white/red (%): 3200:48 Lifetime: (L-90 - in hours L90B50 @ 36000HRS Photosynthetic Light MeasurementsPPF Output*: 1600PPF Efficacy*: 2.5Photopic Light MeasurementsLuminous Flux* 92,000Luminous Flux Efficacy*: 144OtherInput Power: 640wInput Voltage: 120-277Cord length: 10'Plug type (note if bare whip): Not includedPackaging DimensionsDimensions W x L x H (inches): 47x47x4Weight (pounds): 36 Operating Temp range (F): 33-104 IP rating (UL-ETL or estimated final UL-ETL): wetDimming / TuningDimming (Yes/No): YesIndpendent channel dimming (Yes/No): NoController type: External 0-10V Product Warranty:5 years  

The FGI Square 3 Wifi Smart 3x3 LED Grow light with 730nm Far Red
FGI Square 3 WiFi Smart Full Spectrum LED Grow Light with 700-760nm Far Red. $ 499.00 $ 499.00
On Sale! Buy One Get One Free! Add two items to your cart and receive the second for free. Claim Code: WiFiBOGO Looking to get the most out of your grow lights? The WeatherEFX LED Grow Lighting Controller can help you mimic natural sunlight conditions, promoting healthy plant growth. The controller uses either local weather data or your own custom programming to adjust the light intensity and spectrum of your LEDs, simulating changing light conditions throughout the day.  You can also create custom on/off schedules and scenarios, such as sunrise/sunset, to further customize your lighting. Plus, the controller's Cloud Intelligence feature allows you to check in on your lights from anywhere.Take your garden to the next level with more natural lighting using FGI's weatherEFX. Learn more about weatherEFX, and the Cloud Intelligence App on YouTube here:  SCIENCE Botanists studied the effect of leaf shading and competitive growth responses here: Importance of Intermittent Shade to the Ecophysiology of Subalpine Herbs, A. K. Knapp, W. K. Smith and D. R. Young from the Journal: Functional Ecology."A reduction in sunlight caused by clouds, appears to result in substantial increases to water status, and thus CO2 uptake throughout the day. Plants benefit in periodic reduction of evaporative demand that result from natural periods of intermittent shade." DESCRIPTION Looking for a top-quality LED grow light that gives you complete control over your grow operation? Look no further than the FGI Square 3. This powerful light features built-in WiFi mesh technology that allows you to connect to the cloud and monitor your lighting levels and room temperature from anywhere in the world. With the included controller, you can easily adjust the light intensity and spectrum to meet the specific needs of your plants at every stage of growth. And because it uses less energy than traditional HPS grow lights, you'll save money on your electric bill, too! If you're serious about growing healthy, bountiful plants, the FGI Square 3 is the perfect choice. APP/WiFi The Square 3 uses Cloud Intelligence, a SMART devices platform which connects the light to your phone for easy control.  The Square 3 uses a 2.5ghz Wifi connection together with ble mesh to ensure reliable operation even when you are away from the light.  Cloud Intelligence is used by many SMART devices makers such as Amysen, supplier of Wifi Smart Wall plugs which can be used to control fans, dehum, our single color FGI Far Red and UVA lightbars and any other 110V device that runs at less than 10amps.  Square 3 Product Manual  Wifi Controller Manual and Troubleshooting Guide  FEATURES Lightweight - just 13 lbs Slim - 3" deep Cool - won't add too much heat 4 push button dimming settings BUILD Our red + far red booster spectrum will help you grow the largest and most dense flowers. Super bright full spectrum 4000K diodes operate at an efficent 2.3umols/j plus 5% total 660nm red and 730nm far red diodes in a cool square within a square within a square design. This light can run full cycle from seedling to veg to flower. COVERAGE The Square 3 is designed for flowering in 3'x3' spaces at up to 1000 umols/ms. (CO2 recommended for this light level). Or grow at 800 umols/ms without CO2. It can be used for Veg when dimmed. And when fully dimmed can be used over clones and starts too.Below are PAR readings with the lights at three different distances. At 24" expect PPFD to be above 1000 umols/ms, but not as uniform.At 30" PAR will be above 750 umols/ms. This is an ideal light level if not using supplemental CO2. These levels are equal to a typical HPS grow space.At 36" light levels become more uniform from corner to corner but at 680 umols are below what we'd recommend for flower.At 48", light levels are the most uniform and are perfect for mature veg plants. Use the built in dimmer to reduce intensity for young veg plants. Product Manuals:  Square 3 Product Manual  Wifi Controller Manual and Troubleshooting Guide  SPECIFICATIONS FGI Square 3 V2 WiFi LED Grow LightDiodes (White)Diodes Brand name: Shenzhen Lideda Number of pieces 960 CCT 4000K CRI 80CRI Other color Diodes (Red) Brand Name: Shenzhen Lideda Number of pieces 256 CCT NA Wavelength 655-665nm Other color Diodes (FR) Brand Name: Shenzhen Lideda Number of pieces 64 CCT NA Wavelength 730-745nm Ratio mix white/red (%) 3:1Product Warranty/Longevity Warranty (years) 5 years Lifetime (L-90) - in hours 50,000 hours Photosynthetic Light Measurements PPF Output* 700 umol/s PPF Efficacy* PPF 2.3 umol/J Photopic Light Measurements Luminous Flux* 50,000 lm Luminous Flux Efficacy 160 lm/w Other Input Power Watts 310W Input Voltage 110V Cord length 8' (2.44m, 18AWG ) Plug type (note if bare whip) Molded 110V Product Dimensions Dimensions W x L x H (inches) 22 x 22 x 3.5 Weight (pounds) 13 Operating Temp range (F) -20℃ — +40℃ IP rating IP20 Rating CSAPhysical Dimensions Package Dimension W x L x H (inches) 27 x 26 x 6.5 Dimming / Tuning: Push button / Wifi App Product Warranty: 5 years

Hortibest H3 Full Spectrum 170W LED Grow Light System. 4' Trays for Veg Plants. Interconnectable. DLC Listed.
Hortibest H3 Full Spectrum 170W LED Grow Light System. 4' Trays for Veg Plants. Interconnectable. DLC Listed. $ 495.00 $ 495.00
Looking for a top-quality LED grow light to help your plants thrive? Hortibest has you covered with their H3 Slimline 170W Veg LED Grow Light. Perfect for a 4' x 2' space, this veg light is AC daisy chainable for easy installation. With a highly uniform PPFD value, it's ideal for vegetative growth, and the slim design means it won't take up too much space in your grow room. Don't let your plants suffer from poor lighting - invest in a Hortibest LED grow light today! Highlights: Fanless Design IP65 Water and dust resistent Dimmable: 0-10V Daisy Chain Dimming Daisy Chain AC Power Connection OSRAM LED Diodes Input Voltage:120-277VAC Slim Internal Power Supply Design Uniform PPFD distribution over a 2'x4' area The Hortibest Octopus H3 will help your plants reach their full potential. With a sturdy, sleek internal driver design, and a range of adjustable settings, this grow light is sure to give your plants the boost they need to grow strong and healthy. If you're ooking for a gentle, uniform light spectrum perfect for veg phase growth, look no further than Hortibest's Octopus H3. The H3 is designed to completely cover a 4' wide tray with consistent light distribution, making it perfect for your indoor horticulture needs. With PPFD of 500 umols/ms, your plants will be getting the ideal amount of light for optimal growth. Don't let sub-par lighting stop you from getting the most out of your plants - trust the Octopus H3 for all your veg growing needs. Tech Specs: 170W 2.5 umols/j PPF 425 umos/ms Dimensions: 47 x 18 x 2 inches Weight: 7.9Ibs  Built in pre-set dimming knob + on/off 0-10V dimmable using RJ16 cabling, compatible with Trolmaster and FGI dimmers. L90: > 50,000hrs Saftey Certiification: ETL DLC Listed # OC-H-170A FSG 26 D1  Link to PDF spec sheet  

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