Understanding the new DLC PPF efficacy (umols/j) standard and how it is measured

DLC has set standards accepted by US utility companies and their outside regulators to create a level playing field for how lighting products are measured in terms of energy use and efficiency of light production.

 

Understanding the new DLC PPF efficacy (umols/j) standard and how it is measured

Let's dive in to the new DLC 1.9 umols/j efficacy standard, how it is measured and how it's applied to horticultural grow lights. It's a technical topic but deserves attention because it will set some important baselines not only for figuring out utility energy rebates but will also fix some misleading information about lighting fixtures for grow.

Image result for Design Lights Consortium

Photo credit: DLC 

Who is DLC? Design Lights Consortium describes themselves like this: "The DLC® is a non-profit organization whose mission is to drive efficient lighting by defining quality, facilitating thought leadership, and delivering tools and resources to the lighting market through open dialogue and collaboration"  

DLC plays an important role between local energy utilities, energy conservation rebate programs managed by every utility and the regulators who oversee how rebates are measured and paid to the end-user grower. As a quick side note, every utility collects a fraction of the total amount of power they bill their consumers and sets it aside for energy conservation grants. This means that every utility in the country has a budget for rebates. They may or may not allow rebates for cannabis, but they all provide rebates for making energy efficient choices when building a facility that consumes power. Each utility has a team of engineers who manage these programs.  

DLC has set standards accepted by US utility companies and their outside regulators to create a level playing field for how lighting products are measured in terms of energy use and efficiency of light production. This allows utilities to make fact based decisions about how much energy light fixtures consume compared to one another. Basically it saves them a lot of time having to justify their own comparisons. They can choose to rely on DLC data which makes it much easier and therefore faster to calculate rebates based on energy saved.

It will take some time for DLC to process the long list of lights being marketed for grow. Until then utilities rely on their own rationale for calculating rebates, or for not allowing rebates for cannabis growing. Each utility makes their own choices based on policy.

Lighting manufacturers submit each individual light fixture along with a specific set of independent certified testing lab reports directly to DLC (along with a fee) to qualify under DLC's new standards. DLC then sifts through the data to ensure all the required standards are achieved. The light is then placed on an approved list. This list will be all new and focused entirely on any light sold for use in horticulture being submitted for an energy rebate. 

If you don't intend to ask for a rebate the DLC list isn't that important except that there is some real value in having a third party provide independent measurements of light fixture efficiency as compared to one another since claims by each manufacturer can sometimes be confusing or worse, misleading.

DLC, through a long interactive comment process, chose an efficacy (fixture efficiency) standard of 1.9 umols/j, plus or minus 5%. What this means is that any lamp which passes independent third party lab testing of 1.805 umols/j can qualify for DLC approval (subject to other standards as well).

Umols/j is the amount of photosynthetic energy the light produces divided by the amount of input wattage the lamp draws from the wall. That measurement is PPF/W. This is where the new list provides some real value. Lamp wattage, especially LED wattage, is only determined by the power drawn by the lamp. It is never determined by multiplying the total wattage capacity of the diodes. There are a growing number of LED products, particularly low cost on-line retail units being deceptively advertised as higher wattage than what is drawn from the wall. Just because a diode has a 1 watt capacity does not mean it is being supplied 1 watt of power. For the purposes of DLC standards and energy conservation there is only one way to measure wattage and that is the fixture watts consumed. Using the DLC standard will improve product comparisons which will help the consumer to make more informed choices.

So what is PPF? PPF or photosynthetic photon flux is the amount of energy being created by the light which falls within the spectrum which plants "see" through photosynthesis. This spectrum is defined as the total amount of energy between 400nm and 700nm. Spectrum graphs show the curve created by the wavelengths of light emitted in 1nm increments between 350-850nm. So from a photosynthetic energy standpoint PPF is just a portion of the total output. 

Image result for spectrum graph 4000k led

Photo credit: Cree LED

What about PAR (photosynthetic active radiation) as a measurement standard? PAR is a useful measurement of total photosynthetic light intensity being placed on the canopy. However as the industry matures PPF will become a more important comparison measurement than PAR because it includes spectrum and not just total photosynthetic light production. Once a decision is made on which light will be used in a grow, PAR is the correct measurement of total light intensity on canopy based on how far away the lamp is mounted. 

PAR, as it relates to readings from a handheld PAR meter for example is different from PPF because it takes into account distance from the light source. PAR is the same 400-700nm measurement of total energy but because it varies by distance it cannot be the reference standard. PAR is important in terms of handheld measurement devices in a grow, but it does not directly translate to total PPF.

This can be confusing because PPFD (D meaning distance from the light source) is the same as the amount of total PAR shown on a meter. So a PAR meter displays PPFD. It is not however able to measure PPF itself. It can be confusing but the issue comes from the fact that photosynthetic light is not the same thing as visible light. So translations in the math have to be applied to calculate photosynthetic light created.  

This is where it gets interesting. There is no testing device that measures PPF specifically. Instead, the light fixture is placed in an "integrating sphere" which is a device that measures the total amount of "radiant flux" being emitted by the light.

Image result for integrating sphere photo

Photo credit: LED Magazine 

Here is an important point: the integrating sphere does not measure light at a specific distance. Flux does not vary. Each light creates a specific total amount of flux. No less and no more. So we are able to rely on a measurement standard.

We all know that PAR or PPFD changes over distance. Measuring light with a PAR meter changes as the meter is moved further from the light source. 

Integrating spheres don't work that way. Every light measurement is specific and comparable to the next lamp being measured in total flux output.

Because an integrating sphere can't measure PPF directly, a formula must be used. First, all the light being created outside of 400-700nm is removed from the calculation (all the UV and all the infrared). Then a math formula is applied to each wavelength to convert radiant flux to photosynthetic photon flux. This is how total PPF is determined in the lab. There is no handheld instrument which will display PPF. It can only be measured by converting flux measured in an integrating sphere to PPF.

During the DLC standard setting process there was a lot of debate about removing energy below 400nm (ultraviolet UV radiation) and above 700nm (infrared - mostly heat - radiation). The rationale DLC chose was that these wavelengths fall outside of photosynthesis in plants. However an argument can be made the UV impacts marijuana growing and may create different terpene production. Also that infrared energy, which is created in abundance by HPS lights as mostly heat energy, also impacts the plants both in terms of heat absorption but also the overall indoor grow climate. In the end DLC considered the arguments and chose 400-700nm PPF as the standard.

The good news is we have a standard now for our evolving industry and in the coming months and years as more and more lights are submitted to DLC for approval, we'll have a better reference of comparison between lamps. Utilities also benefit because rebates are better regulated which removes a layer of uncertainty in offering energy incentives for grow lighting. 

Standards are never perfect. They always evolve from compromise and regulations feel increasingly tedious but DLC's new requirements will be a benefit to the cannabis industry long term. 

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FGI
FGI UVA LED Grow Light Bundle. 44”, rugged. Premium quality. $ 229.00 $ 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
-17% sale
FGI CTB-6 660-720W Uniformity Pro F-Type. Professional LED Grow Light.
FGI
FGI CTB-6 660-720W Uniformity Pro F-Type. Professional LED Grow Light. $ 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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