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Focus on how LED systems function once installed

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Ask various greenhouse growers what the “best” LED lighting system is and the answers will vary. Some will focus on efficiency figures, some on upfront investment and some on brand awareness or existing facilities. As LED lighting has become common practice in commercial greenhouses, it has become clear that the question itself is changing. The best commercial LED greenhouse lighting system, according to Sollum Technologies’ Abhay Thosar, is one that adjusts spectrum, intensity and Daylight Integral (DLI) in real time to crop requirements, seasonal light availability and energy conditions.

© Sollum Technologies

Energy costs continue to fluctuate, and the availability of natural light varies throughout the year. “At the same time, growers are expected to deliver consistent quality, predictable yields and stable production planning. LEDs are no longer a separate technology, but part of the core infrastructure. What differentiates lighting strategies is not what appears on a spec sheet, but how a system performs under actual greenhouse operating conditions,” he says. “Greenhouse production is inherently variable. Lighting systems must respond to these changes rather than operate as static installations.”

When comparing LED fixtures, the evaluation is often based on efficiency in µmol/J, maximum light output, purchase price, and warranty terms. While these metrics are useful, they do not fully reflect how a lighting system performs once installed. Seasonal and daily variations in sunlight, differences between sites within the same greenhouse, specific responses to crop spectrum and intensity, and changing energy rates all affect real-world performance.

“An apparatus that looks optimal on paper can become restrictive if it cannot be adjusted as conditions evolve,” explains Abhay. “Adaptability is part of performance.”

Commercial LED greenhouse systems are increasingly defined by their ability to adjust over time. The flexibility of the spectrum allows growers to vary the quality of light according to crop type, growth stage and production goals. Increasing blue light during early stages of growth or introducing red light during periods of low light are adjustments that demonstrate how spectral control can be used to influence plant responses.

“Flexible spectrum gives growers the ability to align lighting with plant behavior, rather than treating the light response as a fixed input,” says Abhay.

Light intensity control is another factor. Instead of maintaining constant output over long periods of time, adjustable intensity allows growers to respond to changes in natural light and avoid using unnecessary energy. This approach is closely related to DLI-based control, where lighting decisions are driven by the amount of light a crop receives each day. In advanced systems, DLI targets are achieved through automated modulation of light output as sunlight conditions change throughout the day.

© Sollum Technologies “The goal is to accurately manage consistent DLI without adding complexity to day-to-day operations,” said Abhay.

Greenhouse environments are rarely uniform, making field-level control important. Differences in structure, orientation or crop design can result in different light requirements within the same facility. Lighting systems that allow zone-based adjustments support more consistent crop development throughout the greenhouse.

Integration with existing greenhouse systems is another matter. Lighting interacts with climate control, energy management and crop planning, and systems that operate in this broad framework are easier to manage over time. Long-term adaptability also plays a role, as lighting strategies change frequently to respond to new cultivars, market demands or energy requirements. Systems that support these changes without having to completely replace them offer greater operational flexibility.

Many greenhouse LED installations still rely on static schedules, where prescription lights are set after installation and manually adjusted, if necessary. Dynamic lighting strategies take a different approach by continuously adjusting spectrum, intensity and timing to crop needs, available daylight, seasonal patterns and operational constraints. These adjustments can be made in real time and at the zone level, managing the underlying complexity of the system.

“The system manages variability so growers can focus on crop results,” says Abhay.

In practical terms, the most suitable commercial LED greenhouse systems support consistent crop performance across seasons, improved uniformity and predictable production results. They allow growers to adjust lighting strategies without replacing hardware and manage energy use in relation to production goals. In this context, “best” is less about the most powerful apparatus and more about a system’s ability to adapt as conditions change.

“The important question for growers is no longer which LED system is the best in absolute terms, but which system provides the control and flexibility needed to respond to changing conditions, plant requirements at each growth stage, and long-term operational goals. Greenhouses are dynamic environments, and lighting systems are increasingly expected to function in the same way.”

For more information:
Sollum Technologies
sollumtechnologies.com

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“UK medical cannabis is maturing”

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The UK cannabis market has grown steadily over the past five years, although not always in the way operators had hoped. New brands and imported products have driven much of the expansion, while domestic cultivation has slowed. Alexander Mountain has seen this from the inside long before most people in the industry knew it existed. “I’ve been waiting for this since 2009,” says the founder of growing consultancy Trichome Solutions.

Regulations, compliance, EU-GMP requirements, all of which have made getting a facility off the ground a multi-year exercise. “I’ve worked with organizations and seen firsthand that it takes three, four, even five years to get going,” says Alexander. “It’s a tough market to break into in the UK, which in itself slows down the overall maturation.” The last six months, however, have brought about a change. “There are now clear goals and programs for business. An almost militant approach to protocols. It’s starting to feel like the rest of the EU and Canada.”

© Trichome Solutions

Capitalization and cultivation
Early investment in cannabis in the UK came largely from private capital, and the gap between capitalization and cultivation know-how cost many operators dearly. Consultants were brought in to design and build the facilities, but rarely stayed to operate them. The result was a facility that had to be rebuilt almost as soon as it opened. “A lot of adjustments, changes in workflows, logistical expansion,” says Alexander. “This, of course, requires more capital. This delays profitability and, in some cases, leads to employee burnout.” The model he believes in is the owner-operator structure that has worked in markets such as the US, Canada and Thailand.

In terms of cultivation, genetic selection and post-harvest are where Alexander gives most of his attention. Seasonal changes in the UK favor indoor parameters where possible, although low-light greenhouses have worked for some operators with adequate supplementary lighting. Getting the right genetics for the specific market drives early success and patient retention. Post-harvest, however, he believes the sector is constantly underestimating. “I focus a lot on preserving the plant material and maintaining its chemical profile, particularly cannabinoids, terpenes and volatile sulfur,” he says. “Even simple things, like having enough space to dry properly, seem like common sense. But unless you’ve actually done it, you don’t always realize how important those details are to the quality of the final product.”

UK cannabis demand
Patient demand in the UK has been shaped by the equity market, and licensed operators are working to close this gap. The dynamics here are different from other markets. In Germany and Canada, THC content drives purchasing decisions. In the UK, Alexander is seeing more focus on taste, aromas and the overall experience. “With the amount of choices coming in through imports, people are finding their own strains and becoming more selective,” he says. Closing this gap, in his opinion, involves the farmers as much as the prescribers. “Patient education and support should come from doctors. Producers should teach them about their products. I think growers should invite prescribers more often.”

Over the next three to five years, Alexander expects reliance on imports to ease as domestic supply chains develop and the market stabilizes. He says that there will be operators who come out from the other side, specialized ones. R&D, heritage genetics, premium indoor and post-harvest optimization. “We are now working in the international cannabis industry,” he says. “With comparisons, going on a flight, there is no room for complacency. The operators who find their niche and really excel in it will be the ones who build a strong identity and remain competitive in the cannabis space.”

For more information:
Trichoma solutions
(email protected)
trichomesolutions.com
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DC Mayor Proposes To Let Medical Marijuana And Alcohol Companies Partner On THC Drinks

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The mayor of Washington DC is proposing medical marijuana companies partner with local breweries and distilleries to produce cannabis-infused and non-alcoholic beverages for sale in the nation’s capital.

Under the partnership envisioned by Mayor Muriel Bowser’s (D) Medical Cannabis Beverage Products Amendment Act of 2026, alcohol companies can apply for a medical cannabis production endorsement at a cost of $500 per year to manufacture cannabis beverages, and medical marijuana companies can apply for a $1,000 annual endorsement to import cannabinoids for production.

All beverages would have to be tested by a locally licensed laboratory, and there would be a six percent sales tax on beverages.

“This is an opportunity to support two local industries and keep businesses in DC,” Bowser said in a press release. “We have great local brewers and distillers in our city, we have a strong medical cannabis market, and this is a new opportunity for those two markets to collaborate and create a safe, smoke-free alternative for DC patients”

Breweries and distilleries would not be able to sell cannabis beverages directly to consumers, and the finished products would instead go to medical marijuana manufacturers for testing and distribution.

Sales would be limited to registered medical cannabis patients through dispensaries, and drinks could not be purchased at bars, restaurants, liquor stores and grocery stores.

“It makes sense for the District’s medical cannabis and alcohol manufacturing industries to collaborate to produce medicinal cannabis beverages,” said Fred Moosally, director of the Alcoholic Beverages and Cannabis Administration. he said. “Providing a legal way for our local breweries and distilleries to use their expertise in beverage production is the next step in reaching DC’s medical cannabis market and supporting our local business ecosystem.”

A press release from the mayor’s office said the proposal “works to solve the manufacturing challenges of the medical cannabis industry while providing additional revenue for DC’s local craft beverage producers.”

“Using the existing local bottling infrastructure, DC will expand smokeless therapeutic options for medical cannabis patients, provide additional revenue for the local industry and continue to grow the District’s economy,” he said.

The legislation is now before the District of Columbia Council for consideration.

Although Congress has consistently blocked DC’s legalization of recreational marijuana sales with a pilot approved each year, local officials have worked. expand access through the existing cannabis market for example, allowing residents and even visiting tourists to self-certify without the need for a medical recommendation.

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We’re a small grow, which means we can control things very well

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At 5,000 square feet, Flora Arbor is about as small as a licensed cannabis grower can legally get. That’s not the problem the company is trying to solve. “We’re a very small breed, which means we can control things very well.” he says David Myrowitz, director of cultivation. “It also means that we have to be successful in every round.” Three flower cells, collected in three weeks. There is no such thing as a bad lot to disappear into a larger average. Every shift counts, and the operation is built around that reality.

It starts in the pump room
Reverse osmosis water is fed into holding tanks, nutrients are mixed by an Agrowtek fertigation machine, and the entire system runs from a GCX controller that monitors moisture sensors, dissolved solids, and soil temperature in every room. Canopy sensors feed directly into HVAC, which Flora Arbor runs on Cultiva units. “If you talk to any grower, any grower, they’ll tell you the number one thing for successful growing is having a good HVAC system,” says David. “There is somewhere that we don’t have expenses.”

© Flora Arbor

Genetics and cells
Mother plants are removed every three to six months, so cuttings are always taken from young stock. The clones move from the humidity domes to a humidity-controlled room, then to the vegetables, where a crop-correction protocol runs several irrigation streams per day to encourage growth. Moisture sensors in the grow bags track each drying cycle, and daily watering patterns are revised based on the goals of the grow system.

The flower rooms have a double-level system, with taller plants at the bottom, shorter ones at the top, grouped to keep microclimates outside and an even distribution of light. The second mesh is lowered as the plants develop to give each bud site its own square and keep airflow moving through the canopy.

In a recent route, rooms from different phases of the cycle were working at the same time. Hawaiian Rain has been crossed with permanent marker, disk chips, cereal milk. David pointed to the development of crystals in the Hawaiian Rain cross, the citrus resin charge of Disco Fries, the height management challenge of pushing a cultivar as high as possible without burning them in the lights. “We try to have a nice spread of genetics, a nice representative of each flavor profile and effect, to make sure everyone can get something they like,” he says.

Crossing the finish line
Post-harvest is managed at home, by hand. The product is sorted on the cutting table A-Bd, B-Bud and cutting table, strictly separated, the grade on the label means something. The tiered structure also serves a second purpose. “We think it’s really important to make sure quality flowers are available to people of all means, not just people who can afford the premium,” says David. The three-week harvest cycle is Flora Arbor’s main argument for the consumer. Small batches, constant rotation, nothing stored.

“Every time you get a bag, it’s going to be fresh, freshly picked grass,” says David. “It’s not something that’s been sitting in some MSO’s vault for six months because they’ve collected 2,000 pounds and can’t sell it.” The bet is that in a market where no one has solved the consistency complaint, being small enough to catch all the cattle is more valuable than the economies of scale you allow to get there.

For more information:
Flora Arbor
1300 Abbott Dr, Elgin, IL 60123
847-504-8450
(email protected)
floraarbor.com

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