Lighting strategy for cannabis growing Gavita versus LED

Not only do we look at the mix of color spectrum the sun produces, we also need to understand the exact amount of light intensity the sun rains down on plants in each wavelength of color.
Lighting strategy for cannabis growing Gavita versus LED

Providing the appropriate color spectrum is just one dimension of successful marijuana growing. In fact color spectrum has less to do with yield than most lighting manufacturers care to admit.

There is a second consideration that is even more important than the spectral mix of colors a lamp produces. Maximizing cannabis harvest yields requires the correct level of light intensity be supplied as well. But total intensity measurements such as PAR can be misleading. We'll discuss why and also a solution. Measuring the individual wavelengths of light which when added all together equals total PAR.

With photo spectrometers becoming less expensive and more portable it's now possible to measure any grow lamp right at the grow. One such tool is Asensetek's Lighting Passport and their free mobile App Spectrum Genius Agricultural Lighting or SGAL. We like the Passport because it not only gives us total PAR, but it also breaks down the individual spectrum into 1 nanometer wavelengths and we can see the amount of PPF being created at any distance from the lamp for that single wavelength. Imagine being able to compare lamp to lamp, HPS to LED. Florescent to LED. Or better yet, the Sun to any lamp made today. We can now reverse engineer spectrum and light intensity to any lamp or directly to the sun. 

Asensetek Lighting Passport - shown with optional IPOD or IPAD and free SGAL App

If we can agree that our sun is the benchmark for the right mix of spectrum for photosynthesis, then we need to also look at exactly how much light measured in total intensity the sun provides as it passes through the sky.

The best starting point is to look at the sun’s light intensity at noon on a summer day in an area like California where cannabis flourishes outdoors. Not only do we look at the mix of color spectrum the sun produces, we also need to understand the exact amount of light intensity the sun rains down on plants in each wavelength of color. PPF (photosynthetic photon flux) is the measurement of the amount of micromoles that land on a target area - for example the top canopy of cannabis plants. And PPFD simply adds a distance measurement to PPF. 

At noon on a sunny day in California in June we measured the PPFD from the sun at 1978 micromoles (Figure A). Closer to the equator that number is higher and further north it drops lower. And of course at night it is zero. 

PPFD Spectrum

Figure A; Sun light spectrum and intensity per wavelength in micromoles in California in June at noon

The chart above shows PPFD (photosynthetic photon flux density in micromoles - the amount of photosynthetic light that actually hits your target area) scaled on the left. Wavelengths are scaled at the bottom. We can see for example that in the 600NM orange/red wavelength that the sun is peaking at about 7 micromoles. Regardless of the type of lighting, HPS versus CMH versus Fluorescent versus LED, it’s important to use the sun as the ultimate baseline of comparison.

The black line represents the McCree Action Curve, photosynthetic light level where all plant life benefits optimally. Light within the curve is ideal. Beyond the curve is unused by plants. The McCree Curve is an important target when choosing an artificial lamp for growing marijuana.

Cannabis plants can’t tolerate 2000 micromoles of energy for a 12 hour growing day. So we look at the average amount of sunlight which plants receive during the entire day. 

Average outdoor PPFD for a 12 hour day ranges widely however a June average in California is about 1000 micromoles.

We know from hundreds of cannabis grow tests with a wide variety of artificial lighting types that yields will improve when the canopy is continually provided with between 800-1200 micromoles. Our testing has shown that 1000 micromoles is an ideal target for average top canopy lighting. Some flowers will stretch into higher light levels while others will be below the average canopy and receive less. Providing 1000 micromoles also ensures flowers deeper in the plant canopy benefit from the intensity as well which results in increased dry weights and premium “A type” flower yields.

Looking back at Figure A we can use a rule of thumb that the average daily intensity we target on canopy for any specific color wavelength will be about half of what the chart shows for actual California maximum light intensity. So for example in that same 600NM orange/red peak we discussed above of 7 micromoles, we know that we need to find an artificial light source that provides at least 3.5 micromoles for the entire flower cycle for that wavelength. Any light source which does not achieve the target average will result in sacrificing plant yields. 

We also know that traditional HID (high intensity discharge) lamps are considered the gold standard in indoor gardening. Gavita double ended high pressure sodium lamps have been one of the most popular lamps for years for flowering. And Gavita ceramic metal halide lamps, which include more blue, are popular for the vegetative phase of growing. Likewise T5HO fluorescent lamps are popular for the clone phase and early veg phases.

As much as we want to try to replicate the balanced spectrum and average intensity of sunlight, FGI decided that we better also focus on understand why traditional lighting works and be sure to include this spectrum and intensity in our lamps as well.

We’ve visited hundreds of indoor grows using Gavita style lamps. Most growers tend to have the lamps hung between three and five feet above the top of the maturing canopy. Less than three feet begins to risk burning the plants from the heat the lamps produce. And further away than five feet the plants begin to look spindly and less healthy. Measurements of Gavita HPS spectrum and intensity look like Figure B below.

PPFD Spectrum

Figure B; Gavita 1000 w pro HPS spectrum and intensity at 36” from canopy

As compared to the sun peaking at 7 micromoles of orange/red energy – and our rule of thumb goal of providing 3.5 micromoles of average over 12 hours-- we can see that the Gavita does pretty well and is peaking above the target average at 5 micromoles. Gavita lamps work well in cannabis growing so it reasons to follow that any other lamp being considered to grow cannabis needs to be in this range. Anything below this range won’t grow the highest yielding plants.

As a comparison, the Gavita ceramic metal halide lamps which work well during the veg cycle clearly don’t provide the orange/red energy that their HPS lamps produce. Figure C below shows the Gavita CMH spectrum and intensity also at 48 inches above canopy. Total orange/red 600nm peak light production is 2 micromoles which explains why high yields cannot be obtained because the lamp produces 30% less light than the target of 3.5 micromoles of natural sunlight.  

PPFD Spectrum

Figure C; 660 watt Gavita ceramic metal halide lamp at 48” above canopy

We do know that the Gavita CMH lamps have proven to work well during the veg phase of cannabis growing and most growers keep their CMH lamps high above the canopy. Using the data we gathered in Figure C we know that veg plants desire blue light in the 440nm wavelength range. The CMH chart shows peak blue energy at about 1 micromole on average for a 20 hour veg operation. Looking back to the sun in Figure A we can see that a little over 5 micromoles of peak energy is produced and using the rule of half, our target is 2.5 micromoles. It could be said that the Gavita, at 48”, is not hitting the blue light target. And this is where hanging height on lamps becomes a tradeoff of benefits versus harm. In this example the CMH lamp should be closer to the plants.

If we lower the Gavita CMH lamp to increase the level of 440NM blue, then we’ll also increase the level of 600nm orange/red which we know from experience produces early stretching of the plants. Depending on style, many growers prefer more compact and lush veg plants prior to moving them in to flower and pruning to encourage formation of flower nodes and branching which maximizes production as the plants mature. Too much red will trigger the wrong type of growth.

Fluorescent lamps which are popular during cloning and earlier veg phases of growing is worth taking a look at too. Figure D below is a typical T5HO 8 tube lamp at 20” over young veg plants.

PPFD Spectrum

Figure D; T5HO 8L fluorescent lamp at 20” over canopy

Figure D helps to explain why Gavita CMH lamps and fluorescent lamps both work well for veg phase growing. They both produce peak energy in blue and orange/red. Peak 440nm blue is almost 1 micromole and peak 600nm orange/red is about 1.5 micromole. For very young plants our rule of thumb for light intensity should be 25% of the suns peak energy. Fluorescent lamps achieve that average however due to the spikey looking spectrum the plants are not receiving the broad range of spectrum the sun produces. This is another good reason not to look at total PAR because a fluorescent lamp might seem to be producing good total amounts of photosynthetic light but we can see that it’s not a consistent amount of light across the spectrum.

So now we have a pretty good target to aim for. We understand targeted light intensity from studying the sun. And we know that Gavita lamps work well in flower and veg. And that fluorescent lamps work well in clone and veg.

Any lamp you consider moving forward should provide targeted average intensity from the sun and all the benefits of the Gavita and T5s. Any lamp which lacks our target spectrum or intensity is likely not to work very well in the various stages of cannabis growing.

Evolution of LED grow lighting

LED grow lighting is an evolving area of study. Many growers are suspicious about the benefits of LED, having tried products that didn’t work in the past or heard from the community they don’t work. And for good reason. We’ve taken hundreds of measurements from dozens of LED lamps across the entire industry. We’ve had growers show us plants that don’t stack up well as compared to plants under Gavita or T5s.

Figure E below is good example of why not all LED lamps work as well as the sun or Gavita. The Illumitex Powerharvest LED spectrum and intensity is different than what we’ve decided our target is. And we can also see why the grow results are very different than Gavita.

PPFD Spectrum

Figure E, Illumitex Powerharvest LED as 36” above canopy

As compared to flowering under Gavita HPS the Powerharvest will only supply peak 600NM orange/red energy of less than 1 micromole versus our sun target of 3.5 or Gavita actual production of 5 micromoles. There is a major difference in 660NM red energy. Looking back at Figure A and what the sun produces with a peak of 8 micromoles of 660NM red, the Powerharvest is producing over 4 micromoles. That is within our “rule of thumb” target of 50% of the sun’s noontime output. But it’s 400% higher than what the Gavita produces of the same red energy. Experience has shown that very high levels of red energy cause the plants to stretch faster which can cause the plants inter-nodal flower spacing to be too far apart and become spindly. Light bleaching of the top flowers can also become a problem.

But some growers do just fine with the Powerharvest, too, which tells us that cannabis can be grown under a variety of light conditions as long as the appropriate intensity is provided too.  However at FGI we prefer to target the spectrum and intensity of the sun and Gavita because so many growers swear by the results.

We now have a good understanding of how to target any lamp you are considering not just in terms of light spectrum but more importantly in terms of the amount of energy we are supplying to the canopy in micromoles at any wavelength we feel is most important.

Targeting light intensity on canopy

The grow lamp industry, both traditional and LED does a poor job of supplying complete information about lamp intensity.

Most manufacturers supply only total PAR, which is the sum total of all the energy between 400-700NM. Total PAR does not include the individual spectral components of the light, thus is not a useful number and should be avoided in decision making.

The total PAR output of the sun peaks at 2000 micromoles at noon. The total PAR output of the Gavita Pro HPS hung at 36” is 470 micromoles. Total PAR output for the Illumitex Powerharvest, above, was 620 micromoles. However the makeup of those total amounts of PAR was very different and the plants development and harvest yields achieved under these light sources were also different.

At FGI we have a vast library of spectrum and light intensity data. As we designed our own line of lamps made here in Washington we used this data to target both the color spectrum we knew worked by grouping the highest yielding grow lamps together and separating out the average or below average lamps.

At a minimum, we wanted to incorporate the light spectrum and intensity of Gavita HPS for flower and CMH for veg. But we also chose to incorporate additional broad light spectrum which we knew from measuring the sun and outdoor grows is the proper target.

And most important, we designed our lamps to achieve very specific light intensity (PPFD) levels in each wavelength that makes up the total PAR output of our lamps.

Designing a lamp to hit targeted intensity while also reducing energy use is a tricky balance.

If the light is fixed at a certain height and light levels are too high or too low we have just two options. Either the voltage must be increased or decreased to hit the target intensity through dimming.

The second option is to physically move the light source closer or further from the plant canopy. When designing spectrum and intensity for cannabis with an eye to energy conservation, LEDs have a clear advantage. And to take full advantage of all that valuable photosynthetic light the lamp is producing it makes most sense to hang the lamp closer to the canopy to avoid the loss of light which occurs as the distance from the plants increases. This is where additional strategies like automated light lifting becomes important because we can slowly raise the lamps as the plants stretch.

The new generation of diodes are much more energy-efficient than older higher-wattage LEDs. The chips operate at much lower heat output. In doing so light output from a single diode is also less in terms of PAR output. But arranging the diodes closer together allows us to create the intensity we prefer.

Hanging the lamps closer to the canopy allows us to manufacture lamps which consume fewer watts and save more energy. This translates to lower cost of production in cannabis growing and higher efficiency of grams per watt produced. Secondary benefits of lower hanging heights include the ability to grow vertically in racks because LEDs run cooler. High Intensity Discharge, lamps like HPS and CMH, cannot be hung as close to the canopy without burning the plants or creating too much heat under the plant levels above, so vertical growing is nearly impossible with older style lamps.

The FGI line of LED lamps

FGI designed a full line of lamps for each stage of growth. Our 100 watt Lightbar is a low intensity lamp designed for cloning or earlier veg stage growth. Likewise our 185 watt Lightbar is designed for medium intensity to replace T5HO fluorescents and CMH used in veg. And our two 500 watt and 700 watt Lightpanels are designed to replace HPS lamps in flower.

How FGI stacks up against the competition

Flower/bloom

The FGI Lightpanel 700 and 500 use the same spectrum but have different light intensity output for different types of installations. The 500 watt Lightpanel produces the highest amount of light intensity over a smaller amount of area. The 700 watt Lightpanel covers a greater area of canopy.

Figure F shows the spectrum and intensity at 18” hanging height, the most efficient height for maximum intensity.

PPFD Spectrum

 

Figure F; FGI Lightpanel 500 V/B at 18”

Using the rule of thumb developed from looking at the sun in Figure A and the Gavita HPS in figure B, we targeted orange/red energy peaks at a high of 5 micromoles (Gavita) and a low of 3.5 (average sun). The Lightpanel achieves the goal: coming in just under 5 micromoles. Looking at the blue energy produced by the sun we targeted 2.2 micromoles and the Lightpanel exceeds that measurement at 3.7.

The Lightpanel has all the benefits of the spectrum and intensity preferred by Gavita HPS users but it also includes much more of the full spectrum of light the sun produces, setting it apart from a typical HPS lamp and moving the spectrum closer to that of outdoor California sun. Total PAR output for the Lightpanel (above) at 18” is 1136 micromoles, just under the 1200 micromole maximum light intensity recommended for cannabis.

Veg/clone

The FGI Lightbar 100 and 185 use the same spectrum as one another but in different intensities based on the desired light levels for young plants versus maturing veg plants.

PPFD Spectrum

Figure G; FGI Lightbar 185 at 18”

As compared to preferred CMH lamps (figure C) made by Gavita, the Lightbars produce peak blue energy of 1.3 micromoles, (equal to the CMH output) and peak orange/red energy of 1.7 micromoles (also equal to the CMH output.) Once again our spectrum and intensity includes all the preferred light of Gavita CMH but also adds in much more of the full spectrum the sun produces which is lacking in CMH lamps.

The same is true in comparison to T5HO lamps (figure D). The Lightbars exceed the amount of preferred blue and orange/red light produced by fluorescents and also include most of the green energy which is not found in CMH lamps.

Summary

It becomes clear that light spectrum is only a part of the equation when comparing various lamps. And looking only at total PAR output misses the mark too. But when spectrum and PAR output are combined into direct comparison between what has worked well for growers over time. Then adding in a comparison of the sun, nature’s best grow light, the science behind lamp design can be demystified. We can now design a very specific light spectrum and very specific light intensity allowing us to push the yield and potency to the maximum potential output.

Large scale commercial cannabis growing requires maximizing harvest yields time and  time again, while focusing on the reduced cost of electrical operation for lamps and heat removal. Paired with generous incentives offered by many utilities to convert from high energy HPS, CMH, and fluorescent lamps, the return on investment for installing the new generation of cannabis-tuned LED now makes sense more than ever before.

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Forever Green Indoors
FGI Square 320W SMART LED Grow Light With 730nm Far Red Spectrum $ 295.00 $ 329.00
Boost Your Grow with FGI Square 3 WiFi LED Grow Light Maximize yields with smart, full-spectrum lighting Optimized for Maximum Growth The FGI Square 3 WiFi LED Grow Light delivers exceptional full-spectrum lighting, including a 730nm far-red booster to enhance flowering and fruiting. Designed for both professional and hobbyist growers, this 320W light ensures robust plant health and growth. Innovative Features: Full Spectrum Lighting: Covers all essential light wavelengths for vegetative and flowering stages. 730nm Far-Red Diodes: Promotes flowering and fruiting for higher yields. WiFi Connectivity: Control your grow light from anywhere using the free app. High PAR Output: Ensures efficient light distribution and maximum plant absorption. Energy Efficient: Low power consumption with high output. Why Choose FGI Square 3? Enhanced Plant Growth: Tailored light spectrum boosts photosynthesis and plant development. Smart Control: Manage light settings remotely, providing flexibility and convenience. Durable and Reliable: Built with high-quality materials for long-lasting performance. Proven Spectrum: Compare our plant growth spectrum to other lighting types. SMART WiFi Enabled  Use our exclusive Wi-Fi module for additional expanded capabilities.  Convenience and Flexibility: Remote Management: Control the light settings from anywhere using a smartphone app. Adjust intensity, schedules, and spectrum without being physically present. Real-Time Monitoring: Monitor the status of your grow lights in real-time, ensuring optimal conditions for your plants at all times. Custom Schedules: Create custom lighting schedules to mimic natural sunlight cycles, promoting healthier growth. Energy Efficiency: Adjust light settings to optimize energy use, reducing electricity costs. Integration with Smart Systems: Connect with other smart devices for a fully automated grow room. Our customers like Smart control for:  Travel Convenience: If you're away from your grow room, you can still adjust lighting schedules to adapt to changing conditions or plant needs. Efficiency for Commercial Growers: Manage multiple grow lights across different locations from a single device, streamlining operations and ensuring consistency. Immediate Response: Receive alerts for any issues (like power outages) and make instant adjustments to prevent potential plant stress or damage.  Photosynthetic Light Output Charts  PAR readings with the lights at three different distances. At 24" expect PPFD to be above 1000 /ms, but not as uniform.   Square 3 Product Manual  Wifi Controller Manual and Troubleshooting Guide  SPECIFICATIONS FGI Square 3 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* 1120 umol/s PPF Efficacy* PPF 2.38umols/j Photopic Light Measurements Luminous Flux* 67,000 lm Luminous Flux Efficacy 168 lm/w Other Input Power Watts 320W 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: 3 years against defects. See our warranty policy page for details. 
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FGI UVA LED Grow Light Set. 44”. Waterproof. 340-400nm. Plants, aquariums, mushrooms.
Forever Green Indoors
FGI UVA LED Grow Light Bundle. 44”, rugged. Premium quality. $ 239.00 $ 245.00
DESCRIPTION Rugged, waterproof, glass lens, 100-277 VAC. This unit is built to last.  The FGI 385nm UV Lightbar is designed to provide targeted supplemental blue energy to equal natural sunlight levels. At Forever Green, we strive to match natural sunlight with our lighting products. The reason for this is that plant, corals and mushroom morphology is affected by the spectral composition of light, which means that different wavelengths of light can promote different growth characteristics. In particular, blue light is known to encourage compact growth and strong stems, making it an essential part of plant development. By providing plants with the same level of blue light as they would receive from the sun, the FGI 385nm UV Lightbar ensures that they can grow and develop in the best possible way. As a result, it is an invaluable tool for any gardener or plant lover who wants their plants to thrive. Science behind using UV-A supplemental energy on plants Recent studies at Utah State University have shown that plants absorb and benefit from light between 380-740NM. This research has led to the study of E-PAR or extended PAR and is redefining measurement of photosynthetic light.  Below are the spectrum charts which compare natural sunlight to full spectrum LEDs and then to full spectrum plus supplemental UV.  The result is a closer match to sunlight providing more of the beneficial blue light that plants benefit from.  Sunlight Levels of 380NM UV Natural sunlight provides plants 1.22 umols of 380nm blue energy.  Natural Sunlight Spectrum Blue Energy 1.2234 umols Typical Full Spectrum LED Lack 380NM UV Full spectrum LEDs have limited blue spectrum which peak at 460nm.   Full Spectrum LED 460nm Blue Energy Levels .0514 umols Full Spectrum LED with Supplemental 380NM UV  Adding supplemental 385NM UV creates a secondary peak of blue energy at 1.5047 umols at 12" from the canopy, roughly equaling natural sunlight.  Supplemental UV Spectrum plus Full Spectrum Blue Energy 1.5047 umols (3x greater)  Build Quality These are high quality units with a crystal glass lens cover to protect the diodes and allow for cleaning. The all aluminum frame dissipates what little heat the bar creates. At 30 watts the Lightbar sips energy too.  Spectrum Theory  Blue energy is scientifically known to help form more compact plants. More lush leaf growth, stronger and larger stems and tighter internodal spacing. We gave a prominent researcher one of our UV-A LEDs and he said:  "Your UVA lights arrived and we have confirmed their 385 nm peak. This looks like a high quality fixture." He went on to say: "Elevated exposure to UV photons is known to enhance the synthesis of UV blocking compounds in the leaves of many species and it is reasonable to think that UV photons can increase the synthesis of secondary metabolites in plants." And further, "I expect we will find value in dosing of CSativa plants with UV photons, but not surprisingly, the effects will likely interact with UV wavelength, intensity, timing of delivery, and growth stage." The UVA Lightbar fits neatly inside the frame of our Uniformity Pro LEDs as well as many other multi-bar style full spectrum LEDs. Use We recommend two of our UV-A LEDs over each 4'x4' area. The slim design allows them to be hung inside the frame of most 6 and 8 bar LEDs. Mounting height should be at the same level to avoid creating shadowing.  Control A basic digital 110V wall timer can be used, or if using the TrolMaster Hydro X we recommend the DSP-1 module for 110V or DSP-2 for 120V power connection and multiple on/off timer programming.   ~Technical Specs~ Product 30W(±5%) 20 UVA Diodes Per Bar 100-277VAC,50/60 Hz 102.3BTU IP65 44.88”x 2.24”x 1.53” 4.4 lbs Photometric File Download Product Warranty (see our warranty here) 3 year warranty
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FGI CTB-6 660-720W Uniformity Pro F-Type. Professional LED Grow Light.
Forever Green Indoors
FGI CTB-6 660-720W Uniformity Pro F-Type. Professional LED Grow Light. from $ 995.00 $ 1,195.00
The FGI CTB-6 F-Type (full spectrum) is the best grow light we've ever sold. It outperforms all others in its class. So good it’s our Gen III Uniformity Pro model; a long line of top performing commercial grade LEDs from Forever Green Indoors.  Premium built LED grow lighting designed by CABA Tech, experienced grow light electrical engineers here in Washington. Tested extensively in the field by experienced growers. (See installs on the YouTube link below). Built to last with premium quality components. They don't build them like this anymore. Full five year warranty.  We purchased the entire production run and have over 1000 in stock. Exclusively available from Forever Green Indoors.     Product Unboxing Video    Build Quality The CTB-6 660W commercial grow light is constructed to ensure long term performance in any environment.   Heavy duty aluminum enclosure for drivers and controls. Aluminum tube frame that folds open.  Multiple 277 watt solid state drivers power three different LED diode colors. Drivers are digitally programmed to output our patented grow spectrum. Warm white, cool white and red LEDs are tuned perfectly for plant growth indoors. All electrical connections are sealed and epoxied to prevent moisture from affecting the light long term. Diodes are sealed with multiple conformal coatings to protect from VOC's in the grow space.  Photometric tests downloads are below. We're so confident that you'll love this LED that we are extending a 12 month money back guarantee for all units purchased online, here on our site. Volume purchase pricing available. Contact us for a quote. This product comes with a 12 month, no questions asked, money back guarantee.   Control Options Any 0-10V controller. Dims to off. FGI dimming controller - requires wiring harness.  TrolMaster Hydro X Recommended bundle; TrolMaster Hydro X plus LMA-14 Lighting Adapter. Controls up to 60 CTB-6 grow lights. Or add a second LMA-14 on the second channel to control 60 more. All available here on our shopping site (see below).  Highlights 720W Boost Mode Variable dimming knob.  Latest in Lumiled 3535 and Osram long life diodes 1617 PPF @2.58 umols/j (1640 in boost mode) Lifud solid state digital drivers.  Patented grow spectrum controlled by multiple drivers Folds open for easy install Includes rope hangers and heavy duty cable connectors.  110-277 VAC - includes 120V and 240V plug adapters. No special wiring required. Power cord included.  PAR MAP at 24" (Best Uniformity) The CTB-6 demonstrates the most uniform light spread of any multibar LED. At 24" the uniformity is perfect over 16sf of canopy. At 18" PAR increases to 1100 umols/ms.    Isoline view demonstrates light uniformity across bands of PPFD (created in AGI32 by Lighting  Analysts) 800-1100 umols/ms   Spectrum This light is offered in two custom spectrum formulas. Full Spectrum and Bloom Spectrum. Bloom spectrum has 24% additional red and far red output.  Spectrum Our Full Spectrum version produces a balanced 400-700nm output, and less red energy in comparison to the B-Type model. This is accomplished by supplying balanced power to the three independent LED drivers. Our F-Type model produces 1640 PPF for very high intensity PAR on canopy applications.  DLC listed for commercial lighting rebates. We provide rebate program management to maximize your money back. Contact us to learn more.    View More Content On YouTube     Spec Sheet Download  Tear Sheet Download  Photometric Test Reports  (Boost mode, 50% and 100% power) Specifications: DLC Model: CTB6-660W-R1-SH-FS ID: H-CS84WU 5 year warranty.  Diodes: Lumiled & Osram Full Spectrum, Top Bin Long Life  CCT: 3850 CRI: 86 Drivers: Lifud 277W (3 per light) Tuning: Locked in patented light recipe. Bloom and Full Spectrum Versions. Wattage: 660w-720w boost mode output  Voltage: 100-277V AC Autoswitching Plugs: 220-240V Nema Plug. 110-120V Accessory Plugs Included Coverage: 4x4 with CO2. 5x5 No CO2 Dimensions: 47" x 43" x 4"  Hanging Hardware: Rope hangers & Steel V hangers included. Bars: 6 LED bars, conformal coatings.  Cooling: Fanless passive heavy duty design Weight: 37 lbs Controller: Optional   

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