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Cannabis Facility Build Guide

Lighting — Design for Yield, Quality, and Energy Efficiency

By February 19, 2026March 2nd, 2026No Comments

Lighting — Design for Yield, Quality, and Energy Efficiency

Lighting choices make or break commercial cannabis success. Facilities with optimal lighting achieve high yields and profits; those with poor lighting experience lower outputs and narrower margins. Each lighting decision is pivotal to both your harvest and bottom line.

As a cannabis consultant with global experience designing and developing dozens of facilities, I know that thriving operations succeed by mastering the fundamentals, especially cannabis lighting strategy. Lighting isn’t merely illumination; it’s the foundation of yield, quality, and energy efficiency. Here’s how to light your way to commercial cannabis success.

Establishing a commercial cannabis operation is complex, requiring both proficiency and evidence-based decisions. Every choice, from facility layout to cultivation methods, impacts profitability. Among these, lighting design is often the most transformative.

Lighting design entails creating an environment that increases yield, improves quality, and optimizes energy use. These are the foundations of a profitable and sustainable business.

Key Takeaways

  • Under-canopy lighting is increasingly treated as a competitive necessity for commercial growers focused on improving grams per sq ft.
  • The biggest upside is converting lower and middle bud sites into more “A-grade” flower—reducing larf/popcorn and increasing dense, sellable biomass.
  • Benefits go beyond yield: reduced lollipopping labor, improved plant structure, and potential microclimate improvements below the canopy.
  • Reported results cited include meaningful yield and quality gains across multiple studies and case tests (including ~20%+ yield lifts in some setups).
  • Don’t shop on marketing claims alone—use third-party listings (e.g., DLC Hort QPL) and compare reported vs tested photometric performance.
  • Execution matters: timing, HVAC capacity, airflow, and correct placement can determine whether under-canopy is a win or a headache.

Why Under-Canopy Lighting Is “The Hot Topic” Right Now (0:10–1:30)

Commercial cultivation economics reward higher output from the same footprint. Under-canopy lighting aims to “unlock yield that’s already there” by delivering usable light into shaded bud sites below the canopy—turning more of the plant into harvestable, high-quality flower without expanding square footage.

The 6 Core Benefits (1:32–3:49)

  • More yield, same footprint: More harvestable biomass from lower bud sites that would otherwise remain shaded.
  • Better bud quality: Fewer “popcorn” buds and more dense, A-grade nugs throughout the plant.
  • Full-plant photosynthesis: More uniform growth and reduced stretch, supporting sturdier, more desirable morphology.
  • Labor savings: Reduced need for lollipopping/pruning because lower sites develop into viable flower.
  • Airflow & microclimate friendly: Slim, passively cooled bars can work well if airflow is validated; measure temps/RH before and after install.
  • Potential pest/disease pressure reduction: Fewer dark, humid hiding zones may make conditions less hospitable for some pests/pathogens.

What the Data Says (3:51–4:52)

The video references multiple studies and performance tests reporting improvements in yield and flower quality when under-canopy lighting is implemented. Examples cited include a study highlighted by TSR Grow reporting a ~20% yield increase and a ~27% enhancement in bud size, a California Lightworks Mega Drive under-canopy performance test reporting increased dried trimmed flower and higher A-grade output in a greenhouse setting, and research from Thrive Agritech reporting increased A-grade flowers alongside improved cannabinoid/terpene profiles and a modest THC lift.

Choosing the Right Fixture: Specs That Matter (4:54–6:08)

Nate highlights three core spec buckets to evaluate when comparing under-canopy fixtures:

  • Wattage: Total power draw that will impact heat load and operating cost.
  • Spectrum: The spectral makeup (e.g., blue/green/red/far-red bands) and how it pairs with your top lighting.
  • Efficiency (µmol/J): A “miles-per-gallon” metric for how effectively a light converts electricity into usable photons.

How to Spot Marketing Hype: Use the DLC Hort QPL (6:08–10:08)

The DesignLights Consortium (DLC) maintains Qualified Products Lists (QPLs), including a horticultural category (“Hort QPL”). The video notes that some product info and search functionality is unlocked via a MyDLC account.

What to check on listings:

  • Reported vs tested photometric performance: Compare manufacturer claims against third-party test results to catch inflated numbers.
  • Spectrum breakdown: Review the distribution across blue/green/red/far-red bands and confirm it fits your strategy.
  • Evidence of third-party vetting: Useful for reliability screening and potential eligibility for utility rebate programs.

Things to Avoid When Implementing Under-Canopy (10:09–12:23)

Under-canopy lighting isn’t “set it and forget it.” The video flags common pitfalls that can undermine results:

  • Running them too early: Using under-canopy in veg or early flower can waste energy; the video suggests turning on around 14–21 days into flower (post-stretch).
  • Underestimating HVAC + humidity load: Added power adds heat, and a full canopy can increase transpiration—verify cooling and dehumidification capacity.
  • Bad placement: Incorrect height/angle reduces effectiveness; the video calls out aiming upward and typically positioning ~8–12 inches below the canopy.
  • Spectrum mismatch concerns: Consider aligning under-canopy spectrum with top lights to avoid conflicting signals to plant photoreceptors.
  • Ignoring airflow validation: Stagnant air under the canopy can create stress—monitor temps/RH and adjust fans as needed.

Products and Next Steps (12:25–14:26)

The video emphasizes there’s no one-size-fits-all fixture. It suggests comparing options by power, spectrum, efficiency, and practical features like daisy chaining and voltage flexibility. It also notes that in some installations, utility rebates may significantly offset (or even cover) the cost—depending on region and program eligibility.

[00:00:00]
[Music]

[00:00:03]
[Applause]

[00:00:10]
Hey everyone, Nate from CannaCribs. So today we’re talking about under canopy lighting because it is one of the hottest topics in cannabis cultivation at this moment in time. And if you’re not using under canopy lighting in your cannabis grow and you’re growing as a business, you’re probably kind of falling behind. So, let’s chat about that a little bit.

[00:00:31]
You know, if you’re not using under canopy lighting, you could be losing yield to larger buds and your competition could be pulling more weight and more A-grade colas. You know, referring to those larger, more dense, potent buds that normally are only at the top of your plant, but you can be getting those in the middle and bottom of your plant. So, they’re doing that with the same amount of square footage.

[00:00:52]
Under canopy really isn’t the latest trend. It’s becoming a necessity for a lot of growers who want to stay competitive and boost their yields per square foot and maximize the value of every plant they have in their facility.

[00:01:05]
When building out new facilities or optimizing existing facilities, our CannaCribs consulting team is now recommending under canopy for all building installations. As long as you have the budget for it, it makes a ton of sense on the front end.

[00:01:18]
So, let’s go over why under canopy lighting is changing the game and teach you some tips and tricks of how to shop for under canopy lighting, so that you know the difference between marketing hype and true performance of a light.

[00:01:32]
Benefits
Let’s talk about the core benefits of under canopy lighting first. There are six of them. When we talk about under canopy lighting, we’re really talking about unlocking yield that’s already there in your plant. It’s just kind of hiding in the shadows. Let’s go over a few points that are really important to note.

[00:01:48]
One: you can get more yield from your garden with the same footprint. So, by illuminating the lower bud sites that are otherwise remaining shaded, the under canopy lighting unlocks basically this additional harvestable biomass. It supports higher grams per square foot without expanding the facility footprint—especially impactful for environments where expanding your footprint can be very costly.

[00:02:12]
Two: boost in bud quality. A lot of your plant—what comes off of it—are these popcorn-like buds. With light reaching the lower branches, you’re going to get more dense A-grade nugs, as I mentioned earlier.

[00:02:25]
Three: full plant photosynthesis. Cannabis plants tend to stretch towards the light source, which can lead to elongated stems and less desirable bud structure. But providing light from below makes the plant grow a little bit more uniformly, and it reduces the need for the stretch—resulting in a sturdier, more desirable plant morphology.

[00:02:43]
Four: labor saving. Cannabis growers usually trim or prune plants below the canopy. This “lollipopping,” as it’s commonly known, makes sense when you don’t really have good bud formation down there on that bottom part of the plant—but it does take a lot of time. So, with under canopy lighting, you can eliminate or vastly reduce the amount of time it takes for you to lollipop your plants because you’re going to get good bud formation down there.

[00:03:10]
Five: air flow and microclimate friendly. Under canopy lights are slim and passively cooled bars, and they won’t really block air flow or create heat pockets as long as you have proper air flow in your room. Make sure to measure the air flow, the temperature, and the humidity within your canopy before and after installing your lights to see if fans need to be adjusted or added.

[00:03:32]
Number six: decreasing pests and disease. This one’s kind of crazy, but under canopy lighting actually deters some pests from hanging out in the shadowy areas of your plant. So, the under canopy lighting also reduces the relative humidity in that area below the plant, which makes the area less hospitable to some pathogens and pests.

[00:03:51]
Data
Let’s next talk about some data that supports some of these results. For example, a study highlighted by TSR Grow revealed a 20% increase in yield and a 27% enhancement in bud size when under canopy was utilized.

[00:04:04]
Practical applications further support these findings. For instance, a performance test of California Lightworks Mega Drive under canopy system reported a 29.84% increase in total dried trimmed flower and 11% rise in A-grade flowers at the Harborside greenhouse. Yes, a greenhouse—not an indoor facility.

[00:04:24]
Similarly, this research conducted by Thrive Agritech indicated that integrating under canopy lighting led to a substantial increase in A-grade flowers—referring to the highest quality buds versus buds which are lower quality, less dense, and less potent. Not only were there more buds, but they also exhibited an increase in cannabinoid and terpene profiles throughout the plant, accompanied by a notable 5% increase in THC levels across the crop.

[00:04:49]
Now, we’re going to link all these studies below so that you can click through and see them for yourself.

[00:04:54]
Choosing the Right Fixture
Now, let’s talk about choosing the right fixture. Let’s start by talking about how under canopy lights are measured. Usually it will be by wattage, spectrum, and efficiency of the lights—measured by a term called micromoles per joule (µmol/J). You will see it often notated, and it basically measures how efficient a grow light turns electricity into usable light for your plants.

[00:05:18]
The more micromoles per joule you have, the more light you’re getting to your plant per watt of energy that you’re paying for—basically, more yield per watt that goes into your plants.

[00:05:27]
For example, if a light is rated at 2 µmol/J and another one is rated at 3 µmol/J, then the light at 3 µmol/J is 50% more efficient at converting power wattage into plant-growing light. It’s kind of like miles per gallon in your car, but for grow lights and photosynthesis.

[00:05:50]
Some companies will claim a certain amount of micromoles per joule—whether it’s on their packaging, their advertising—but sometimes they might budge a little bit on that marketing rating to entice customers, to make them think that their light is actually maybe a little bit more efficient than it actually is. We’re going to teach you how to be an informed buyer. Let’s jump into that.

[00:06:08]
First, there’s a third-party organization called DLC, which stands for DesignLights Consortium. DLC is an independent organization that provides third-party testing and certification for LED grow lights, ensuring that they meet strict energy and performance standards. Their certification helps growers identify high-quality, reliable lighting products that may qualify for utility rebates.

[00:06:33]
Let’s jump over to the website really fast and I’ll show you how to use it. Okay, so here’s the DesignLights Consortium website. First thing you need to do is you need to make an account. You can’t access the proper reporting without making an account.

[00:06:46]
Then once you do that, click on “Find Products” and then go to “Hort QPL.”

[00:06:51]
Once you click into Hort QPL, you can basically search any LED grow light that has ever been submitted to the DLC. And basically, if a light is from a well-known manufacturer and it’s a light that you can get rebates from—like, let’s say, your local energy company—it probably is in the DLC.

[00:07:13]
And I would even venture to say that I would be very reticent to buy a light that’s not listed in the DLC because that doesn’t mean that you probably have third-party reporting showing how efficient or non-efficient that light is.

[00:07:27]
So, if you first get into the DLC, how you search lights is just searching any light. So I can look up, for example, Grower’s Choice LED lights—another popular brand. We sell a lot of them. You can see the under canopy light and a few of their other lights.

[00:07:44]
After you do that, you can start searching for fixtures. Like, for example, we’re talking about under canopy lights today. I jumped over and looked—this is one of the most popular under canopy lights out there. This is the Craft Farmer light, and he was really someone who popularized under canopy lighting.

[00:08:01]
And here’s how you go through the website. First is reported photometric performance. Then tested photometric performance. Reported photometric performance is what the company said their performance of the light is.

[00:08:14]
So here is the micromoles per joule: 2.4. And then it has total reported photosynthetic photon flux—basically 288 µmol.

[00:08:25]
And then if you look at this part down here, it’ll actually show you the spectrum: 400 to 500 nanometers, 500 to 600, 600 to 700. So this is more blue light—400 to 500—and 500 to 600 is more white light. And then 600 to 700 is really more red light, and then 700 to 800 is really more far red.

[00:08:44]
So I can see that this is a red-dominant light—not so much a far red, but a red-dominant one.

[00:08:48]
Now what I can also do here is go to tested photometric performance, which actually shows when the light was tested by a third party, what reports they got.

[00:09:01]
So the reported was 2.4, but the tested is 2.5. That’s actually really good. That means they report less than they actually tested at.

[00:09:08]
What you really want to look for is when someone reports something like—let’s say they reported like a 2.7 and it actually tested in a 2.5. That means they are actually saying that the light is more efficient than it actually is.

[00:09:19]
And you can see the spectrum here follows a very similar ratio as it does up here. So I would say that’s very honest in terms of its output.

[00:09:29]
And you can see there’s other lights in here. You can see—here’s a California Lightworks under canopy light. This is a new one that came out with some new updated technology. It’s at 3.22 micromoles.

[00:09:42]
And if you go down here to the tested photometric performance, you can see that they’re tested as 3.204. So it’s really spot-on. And you can look at the spectrum on this one—not really far reds here, but a deep, deep amount of reds in terms of the output.

[00:10:00]
So that’s how you can really use this website to drill in and understand what the third-party testing is of these specific lights.

[00:10:09]
Things to Avoid
Now that we know how to use the DLC website, let’s actually go over a couple other things because, like everything in life, under canopy lighting is not perfect. There are certainly things to watch out for when using under canopy lighting.

[00:10:21]
Number one: turning on the lights too early in your schedule. Don’t use under canopy lighting during all phases of your plant’s growth cycle. Like, for example, do not use them in veg. It’s wasted energy. You actually also do not need to use them in early flower. The ideal time to turn them on is usually about 14 to 21 days into flower, after your plants have gotten through their initial stretch.

[00:10:46]
Two: heat buildup under the canopy. When you add more power into your grow rooms, you will also add more heat. Ensure that you have enough HVAC to withstand the added heat load.

[00:10:55]
Like when the canopy is full, the crop will likely have higher overall transpiration rates with the addition of under canopy lights. So this might also increase the humidity load—so make sure you have adequate dehumidification.

[00:11:06]
And also make sure that you have good air flow throughout your rooms. If you have stagnant air under the canopy, you could see some heat stress on your plants. So make sure that you get some air flow down there and monitor your temps at the canopy bottom.

[00:11:24]
Three: placement of them. Poor placement can cost you. Really make sure you place your under canopy lights in the proper spot where they should be pointing up at your plants, and usually about 8 to 12 inches below the canopy where those leaves are.

[00:11:39]
And normally you’ll see them on stands. Stands are highly recommended, and then you can adjust them to the right height.

[00:11:47]
Number four: matching the spectrum to your plants. While we don’t have a ton of data on this, it’s kind of recommended that you try to match the spectrum of your top lights so you don’t confuse your plant’s photoreceptors.

[00:11:59]
Light spectrum guides plant development. And conflicting signals, some people think, can stress out a plant or reduce the efficiency of your lighting.

[00:12:07]
If your top lights are full spectrum, we kind of recommend getting a full spectrum under canopy light—or at least one where that’s not a super deep red and only reds. If your top lights have red-enhanced diodes though, then maybe you can use something that does have a deeper amount of reds for your under canopy lighting.

[00:12:25]
Products
Lastly, let’s run through some products because there is no one-size-fits-all with under canopy lighting. Let’s break them down in terms of power, spectrum, unique features, and which light might be best suited for you.

[00:12:38]
We did build a blog post that is linked below on our site, and it has a chart that shows every under canopy that we sell—and we sell the majority of them.

[00:12:45]
Each light does have their own specifications that make them either more powerful, more efficient, or better suited for certain facilities. As I said earlier, there’s no one light that’s best for everyone, but there is probably one that’s best for your operation and your budget.

[00:13:00]
Illuminar has the most powerful 4-foot under canopy bar that we know of at 160 watts, because most of them were designed to be 120 watts per bar.

[00:13:08]
The California Light Works has their patented Mega Drive, and it makes it easy to daisy chain hundreds of fixtures and run them at any voltage from 120 to 480 volt.

[00:13:20]
And there’s companies like FloraFlex that are offering right now the most efficient LEDs at 3.3 micromoles per joule—as of recording this in about May of 2025.

[00:13:28]
If you want to dig a little bit more into our options and offerings, click on that link below in the blog and you’ll be able to go through all the features and specifications at your own pace.

[00:13:40]
If you’re thinking about buying under canopy lighting and you would like some assistance, please reach out to our team at growershouse.com. We can set you up, make sure that you’re successful with under canopy lighting—which is the most important part—because it is an investment.

[00:13:51]
And if you want to get rebates under canopy lights, we can help out with that too. We’ve actually done full installations of under canopy lighting where in some places the rebate paid for the under canopy lighting 100%.

[00:14:03]
In close, if you’re growing in a cannabis facility as a business and trying to be as good as you possibly can, under canopy lighting is no longer really optional. It’s part of your competitive edge.

[00:14:14]
So, no matter the size of your grow, there’s a fixture that fits your needs. And like I said earlier, check out the full lineup on growershouse.com and one of our consultants would be happy to get you dialed in.

[00:14:26]
So, grow smarter, light deeper, and harvest better. Over and out, my friends.

[00:14:37]
[Music]

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Video Breakdowns

Cannabis Lighting Design: Illuminating Your Path to Yield, Quality, and Energy Efficiency in Commercial Cultivation

Why Strategic Cannabis Lighting is Your Commercial Edge

Maximized Yield Per Square Foot: Cannabis yield increases with higher photosynthetically active light intensity, measured as Photosynthetic Photon Flux Density (PPFD), up to 1800 µmol·m⁻²·s⁻¹ or more. (Rodriguez-Morrison et al., 2021) Improving light delivery enables more efficient photosynthesis, resulting in greater yields from the same growing area.

  • Elevated Product Quality: Light intensity and spectrum affect secondary metabolites such as cannabinoids and terpenes. Strategic lighting enhances bud density, improves chemical profiles, and increases visual appeal. (Huebner et al., 2024)
  • Improved Energy Efficiency: Electricity is a major operational expense in controlled environment cultivation. Selecting efficient lighting technology and implementing optimized schedules can greatly reduce costs and increase profitability.
  • Controlled Plant Morphology: Adjusting light spectrum and intensity shapes stem elongation, leaf size, and plant structure. This results in compact, robust plants that support higher yields and correspond to facility design.

Choosing the Right Lighting Technology for Your Operation

A grow light provides artificial illumination to replace sunlight for plants, stimulating photosynthesis and supplying the required spectrum for healthy development. Each available type presents unique advantages and limitations.

  • LEDs (Light-Emitting Diodes): The Modern Standard
    • Advantages:
      • High Energy Efficiency: LEDs convert a higher percentage of electricity into usable light (around 50%) in comparison to traditional options, greatly reducing operating costs. (The Advantages of Commercial Grade LED Grow Lights, 2023)
      • Low Heat Output: They produce far less radiant heat at canopy level, allowing them to be placed closer to plants without causing stress or burn, and reducing HVAC demands.
      • Precise Spectrum Control: LEDs offer the ability to finely tune the light spectrum (blue, red, green, far-red, UV) to match specific plant growth stages and manipulate secondary metabolite production.
      • Long Lifespan: Generally lasting 50,000–70,000 hours, LEDs require fewer replacements, lowering maintenance costs and waste. (Agrify’s Grower’s Guide to LED Lighting, 2021)
    • Considerations: LEDs have a greater upfront cost and can become outdated quickly due to fast technological progress. For instance, newer models may offer 20% greater efficiency and qualify for energy rebates. (Plant Factory: Unparalleled Results in Commercial Cultivation Facilities – 5,000 FT2 Cultivation Facility, 2025) Delaying upgrades can cause missed savings and higher long-term costs. Evaluate both current features and the rate of technological progress when selecting lighting.
  • HPS (High-Pressure Sodium) Lamps: The Legacy Powerhouse
    • Advantages: High light output and mature, proven technology. Often, it is more affordable upfront. Known for a red-dominant spectrum, effective in flowering.
    • Disadvantages: Significant heat output, calling for strong cooling and ventilation systems, increasing energy costs, and limiting proximity to plants. Less energy-efficient than LEDs (around 30% conversion). Shorter lifespan (~20,000 hours) and declining output over time call for regular bulb replacement. (LED vs HPS Cannabis Grow Lights Comparison Guide, 2025)
  • CMH (Ceramic Metal Halide) Lamps: Balanced Performance
      • Advantages: Delivers a more balanced spectrum (“whiter” light with more blue) than HPS, suitable for both vegetative and flowering stages. Produce less heat than HPS, but more than LEDs.
      • Disadvantages: Moderate efficiency. Bulbs typically need to be replaced every 12 months. Greater upfront cost than HPS but generally less than high-end LEDs.

For most commercial operations, LEDs are the preferred long-term option due to their efficiency, spectral control, and low heat output, particularly where electricity costs are high.

Understanding how light affects plant growth is essential. Multiple essential guidelines guide effective cannabis cultivation lighting strategies.

The fundamental principle of “how does light affect plant growth” lies in photosynthesis, where plants convert light energy into chemical energy. In cannabis cultivation, light strongly influences growth, development, and secondary metabolite production through three key principles: intensity, spectrum, and photoperiod.

CannaCribs Consulting On Site

Light Intensity

Measurement: Photosynthetic Photon Flux Density (PPFD), expressed in micromoles per square meter per second (µmol·m⁻²·s⁻¹). PPFD quantifies the number of photons in the photosynthetically active radiation (PAR, light between 400-700 nanometers that plants use for photosynthesis) that reach a surface each second. Another measurement, Daily Light Integral (DLI, mol/m²/day), reflects the total number of such photons received in a full day. (Daily Light Integral (DLI), 2024)

  • Impact: High light intensity during the vegetative stage promotes compact, strong growth, while higher PPFD during flowering leads to larger, denser inflorescences and increased terpenes. Cannabis is exceptionally light-hungry, benefiting from PPFDs up to 1800 µmol·m⁻²·s⁻¹. (Collado & Hernández, 2025)
  • Targets:
    • Clones: 100–200 PPFD (6-13 mol/day) for gentle, stress-free rooting.
    • Vegetative / Mothers: 300–500 PPFD (19-32 mol/day) for healthy growth and controlled stretch.
    • Flowering: ~1,000 PPFD (43+ mol/day) for optimal bud development, with some strains benefiting up to 2,000 PPFD. (Indoor Growing Stages LED Grow Light Strategies, 2024)
  • Placement & Uniformity: Proper use of grow lights requires correct hanging height to prevent plant stretching or stress. Uniform light spread across the canopy is essential to avoid hot spots, weak zones, and inconsistent growth.
    • Blue Light (400-500 nm): This light color improves root growth, helps shorten the distance between leaves (internode length, resulting in more compact plants), and is important for stomatal opening (letting in CO2) and carbon fixation (building sugars from the air). Not enough blue light can lead to stretched, weak plants.
    • Red Light (600-700 nm): Red light is the most effective color for driving photosynthesis (the plant’s energy production process) and supports the growth of buds or flowers. High levels of red light can sometimes cause bleaching (whitening) of the topmost buds.
    • Green Light (500-600 nm): This light penetrates deeper into leafy canopies, reaching parts of the plant that might be shaded from other colors and supporting photosynthesis there.
    • Far-Red Light (700-800 nm): Far-red light can stimulate stem elongation (taller growth) and trigger shade avoidance, the plant’s response to nearby competition for light.
    • UV Radiation (UVB/UVA): Low doses of ultraviolet B (UVB, 280-315 nm) may boost terpene and cannabinoid (plant compounds) content. However, research on modern cannabis strains shows that too much UVB mainly reduces yield and these compounds. (Huebner et al., 2024) Ultraviolet A (UVA, 315-400 nm) is involved in plant blue-light sensing and related responses.
  • Photoperiod (Duration)
    • Most cannabis genotypes are “short-day” plants, requiring a period of uninterrupted darkness (e.g., 12 hours light/12 hours dark) to induce flowering.
    • “Day-neutral” or “autoflowering” varieties flower regardless of day length.
    • Thorough management of light cycles, including blackout protocols for greenhouses, is essential for year-round production and multiple harvests.

If you want expert eyes on your project, CannaCribs Consulting and the GrowersHouse commercial division both support full-cycle planning—from cultivation system design and cultivation facility layout to equipment sourcing and cultivation SOPs.

Unlocking Hidden Yields: The Power of Under-Canopy Lighting

A major development in commercial cannabis lighting is under-canopy lighting, which uses specialized LED lights installed beneath the plant canopy to illuminate lower leaves and bud sites that overhead lights may not reach.

  • Increased Yield & Bud Quality: Under-canopy lighting exposes lower buds to light, converting smaller buds into higher-grade flowers. This can increase total yield by 20-40% and improve bud density and potency. (Garrido et al., 2025)
  • Labor Savings: Under-canopy lighting improves lower bud development, reducing or removing the requirement for manual removal of lower growth and decreasing labor costs.
  • Improved Plant Morphology & Health: Lighting from below promotes uniform growth and stronger plant structure, reduces stretching, lowers humidity, and helps deter pests in shaded areas, resulting in healthier plants and less disease.
  • Rapid ROI: Increased yield from under-canopy lighting can offset equipment costs within one to two harvests.

When choosing under-canopy lights, prioritize high-efficiency LED diodes (at least 2.5 µmol/J, with top models at 3.0+ µmol/J), select a spectrum suited to your goals, and guarantee strong ingress protection (IP66 or higher). (Under Canopy Light for Cannabis Cultivation | Catalyst Pro – JumpLights®, 2026) Look for DLC-listed certification for verified efficiency and possible energy rebates.

Optimizing for Efficiency: Light Cycle Management & Energy Costs

Cannabis grow lights consume notable energy, so managing their use is essential for financial sustainability.

  • Load Balancing & Peak Demand Reduction: Staggering flowering room light cycles, such as running half the rooms from midnight to noon and the other half from noon to midnight, can reduce peak electrical demand, balance HVAC loads, and lower demand charges.
CannaCribs Optimizing for Efficiency
  • Operational Considerations: Staggered cycles can increase complexity, needing continuous fertigation and reliable automation. Overnight staffing or robust automated systems may be necessary. An even-handed approach elevates energy savings while defending operational simplicity.
  • Integration with Environmental Controls: Light, temperature, humidity, and CO₂ are interrelated. As light intensity increases, so does CO₂ demand and plant transpiration. Lighting strategies should be coordinated with HVAC and CO₂ enrichment systems for optimal growth.

Beyond the Lights: A Holistic Approach to Facility Design

Lighting is essential, but it is only one aspect of a successful commercial cannabis operation. Integrating lighting with all other elements of facility design and operation is important. This includes:

  • Financial Modeling & Planning: Before you buy a single light, you need a defensible business plan that proves profitability, accounting for CapEx and OpEx.
  • Site Design: The physical layout, workflow, and biosecurity zones all impact efficiency and compliance.
  • Cultivation Systems: Integration of lighting with fertigation, water systems, nutrients, and pest control is essential.
  • Post-Harvest & Compliance: Protecting product quality through proper drying, curing, and storage, while observing GACP and GMP standards, ensures your high-quality buds reach the market in prime condition.

Making decisions in isolation, even regarding lighting, can lead to waste and missed opportunities due to complex interactions among facility systems.

Ready to Design Your World-Class Cultivation Facility?

Transitioning from concept to profitable harvest involves many complex decisions. You do not have to manage this process alone. Our team at CannaCribs Consulting is an expert in comprehensive planning, including financial modeling, cultivation system design, equipment sourcing, and SOP development. We leverage industry expertise and scientific research to enhance your cannabis lighting design and overall facility strategy, driving performance, efficiency, and long-term success.

We can help you:

  • Select the ideal lighting technology (LED, HPS, CMH) for your specific goals and budget.
  • Develop precise light intensity and spectrum strategies for each growth stage.
  • Integrate under-canopy lighting for maximum yield and quality enhancement.
  • Implement energy-efficient light cycle management and load balancing.
  • Source vetted, high-performance equipment through our partners like GrowersHouse, often identifying energy rebates that can greatly offset initial costs.

Do not entrust your achievements to luck. Let us help you design a facility that maximizes both plant growth and profitability.

References
  1. Rodriguez-Morrison, V., Llewellyn, D. & Zheng, Y. (2021). Cannabis Yield, Potency, and Leaf Photosynthesis Respond Differently to Increasing Light Levels in an Indoor Environment. Frontiers in Plant Science 12. https://doi.org/10.3389/fpls.2021.646020
  2. Huebner, D. S., Batarshin, M., Beck, S., König, L., Mewis, I. & Ulrichs, C. (2024). Influence of different UV spectra and intensities on yield and quality of cannabis inflorescences. Frontiers in Plant Science. https://doi.org/10.3389/fpls.2024.1480876
  3. (2023). The Advantages of Commercial Grade LED Grow Lights. Grow It LED.
    The Advantages of Commercial Grade LED Grow Lights
  4. (2021). Agrify's Grower's Guide to LED Lighting. Agrify. https://www.agrify.com/wp-content/uploads/2021/09/Agrifys-Growers-Guide-to-LED-Lighting.pdf
  5. (2025). Plant Factory: Unparalleled Results in Commercial Cultivation Facilities – 5,000 FT2 Cultivation Facility. GrowRay.
    Plant Factory: Unparalleled Results in Commercial Cultivation Facilities – 5,000 FT2 Cultivation Facility
  6. (2025). LED vs HPS Cannabis Grow Lights Comparison Guide. Seedbanks.com. https://seedbanks.com/comparison/led-vs-hps-grow-lights/
  7. (March 31, 2024). Daily Light Integral (DLI). Boulder County. https://assets.bouldercounty.gov/wp-content/uploads/2024/04/EIOF-DLI-Controls-Report.pdf
  8. Collado, C. E. & Hernández, R. (2025). Vegetative and reproductive stage lighting interactions on flower yield, water use efficiency, terpenes, and cannabinoids of Cannabis sativa. Scientific Reports 15. https://doi.org/10.1038/s41598-025-27437-4
  9. (2024). Indoor Growing Stages LED Grow Light Strategies. Lumatek. https://device.report/m/2e2e8276d11ab1d0f92ec8775f7315cc260b1f027a2996b45bc63a9e046bc9dd.pdf
  10. Huebner, D. S., Batarshin, M., Beck, S., König, L., Mewis, I. & Ulrichs, C. (2024). Influence of different UV spectra and intensities on yield and quality of cannabis inflorescences. Frontiers in Plant Science 15. https://doi.org/10.3389/fpls.2024.1480876
  11. Garrido, J., Corral, C., García-Valverde, M. T., Hidalgo-García, J., Ferreiro-Vera, C. & Martínez-Quesada, J. J. (2025). Subcanopy and Inter-Canopy Supplemental Light Enhances and Standardizes Yields in Medicinal Cannabis (Cannabis sativa L.). Plants 14(10). https://doi.org/10.3390/plants14101469
  12. (2026). Under Canopy Light for Cannabis Cultivation | Catalyst Pro - JumpLights®. JumpLights.
    Catalyst® Pro
Cannabis facility with rooms labeled subtly (Propagation, Veg, Flower, Dry Room, Vault) like a blueprint

Cannabis Facility Build Guide: Main Hub

Under-Canopy Lighting YouTube Thumbnail

Under Canopy Lighting: Boost Yield, Bud Quality & ROI in Commercial Cannabis [Video Breakdown]

1:1 square vector icon, dark charcoal background. Minimal blueprint-style floor plan of a building, with a small cannabis leaf integrated in one corner, showing room outlines and doorways. Teal and light teal lines on dark, flat modern style, no text.

Site Design — Turn Your Model into a Scalable Facility