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Recent Trends In Horticultural Lighting by David Shiller

William Attardi on April 17, 2026

Recent horticultural lighting trends are centered on smarter LED systems, more precise spectral control, and tighter integration with greenhouse automation. The biggest shift is away from static lighting toward dynamic, data-driven lighting that can adjust intensity and spectrum in real time based on crop stage, natural sunlight, energy prices, and climate conditions. LEDs continue to replace older technologies like HPS because they deliver higher efficiency, lower radiant heat, dimming capability, and better spectral control. Industry and government sources also note meaningful electricity savings versus conventional horticultural lighting, which remains a major driver for adoption in commercial greenhouses and indoor farms. This efficiency story matters because energy is one of the largest operating costs in controlled environment agriculture. As a result, growers are looking for fixtures that do more than just provide photons; they want systems that can optimize output while reducing waste and heat load. More information is available here. Recent Trends In Horticultural Lighting | LightNOW

BriteSwitch: Rebates Bloom as Horticulture Lighting Market Heats Up

William Attardi on November 12, 2025

Once limited to research labs and specialized grow rooms, horticulture lighting has become one of the fastest-growing segments in the lighting industry. As technology costs drop and efficiency improves, these systems are now used in greenhouses, vertical farms, floriculture, and even in facilities producing plant-based vaccines. The global market is expanding at roughly 12% per year and is projected to reach $22 billion by 2033, making it one of the brightest opportunities for both lighting manufacturers and rebate-driven projects. Like they did with traditional lighting, LEDs have revolutionized grow lights. With 20 to 45% less energy usage than conventional HID grow lights, they provide a huge opportunity to cut operating costs for growers. The reduced wattage also means less waste heat, which is hugely beneficial to indoor growing operations. In October 2019, the DesignLights Consortium (DLC) created a new standard and Qualified Products List (QPL) specifically for horticulture lighting. Over the years, the DLC has become the de facto standard utilities use to ensure customers install high-quality lighting when applying for incentives.  In 2025, the DLC released version 4.0 of its technical requirements.  55% of the US is covered by an active horticulture lighting rebate; 53% are calculated on a per-fixture basis.  BriteSwitch Can Help You Find and Capture the Rebates:

Rebates Bloom as Horticulture Lighting Market Heats Up

The DLC’s Horticultural Lighting QPL- What You Need to Know by Kasey Holland

William Attardi on July 16, 2025

Valued at $7.8 billion last year, the global controlled environment agriculture (CEA) market is expanding at a compound annual growth rate of 12.2% and expected to reach $22 billion by 2033, according to a recent market research report. With lighting as the largest operational cost in CEA facilities, opportunities abound for indoor growers to save energy and reduce expenses with the right lights. The average efficacy of listed products has increased by nearly 25% since the DLC launched its horticultural lighting qualified products list (QPL) in 2019. There are now over 1,375 products from nearly 150 manufacturers on the Horticultural QPL – a more than 54% increase in listed products since 2020. The DLC’s Horticultural QPL offers CEA lighting specifiers and contractors increasing product variety, and CEA growers ample opportunities for savings. The DLC’s Horticultural Lighting Program aims to accelerate widespread adoption of high performance, energy-saving LED technology in the horticultural lighting sector. The Horticultural QPL is a key tool in advancing that goal. Accessing the QPL is simple – just create a free My DLC account to start searching. The DLC’s Horticultural Lighting QPL- What you need to know | EC&M

 

Sollum Technologies Partners with Optimal to Advance AI Greenhouse Control

William Attardi on June 12, 2025

Sollum Technologies is pleased to announce a strategic partnership with Optimal, a leader in AI greenhouse control. This collaboration integrates Sollum’s 100% dynamic LED lightingwith Optimal’s AI climate and irrigation control platform, enabling growers to precisely execute their desired growing strategy under rapidly changing weather conditions.  By integrating with Sollum’s proprietary SUN as a Service® platform, Optimal’s AI anticipates the impact of light and balances it with climate and irrigation in real time. Optimal’s AI seamlessly updates settings in the grower’s existing control computer. The result for growers is a fully automated system that precisely executes their growing strategy 24/7 across lighting, climate, and irrigation. https://www.ledinside.com/news/2025/6/2025_06_12_02

Sollum Expands Its Family Of Dynamic LED Grow Lights: SF-ONE™, SF-PRO™ AND SF-MAX™

William Attardi on April 30, 2025

Sollum Technologies is pleased to expand its lighting family, which now features three new fixtures: the SF-ONE™, the SF-PRO™ and the SF-MAX™. Designed to accommodate various lighting strategies, these new LED fixtures will meet the diverse needs of a rapidly growing clientele, from large scale to niche producers.  All products come bundled with the SUN as a Service® cloud-based platform as well as access to Sollum’s smart support so that clients can reap all the benefits of a fully dynamic lighting solution. Each fixture responds to growers’ business priorities:

  • The SF-ONE is the ideal fixture for those who prefer a simpler approach to lighting and who prioritize maximum energy efficiency in large-scale greenhouses.
  • The SF-PRO balances efficiency and flexibility; it was designed for producers whose priorities combine maximizing yield, desired produce quality and characteristics, and who are looking to consistently address the evolving demands of consumers.
  • Finally, the SF-MAX is the ultimate in dynamic lighting – designed for producers who seek crop perfection and require maximum flexibility from their lights.

Sollum expands its family of dynamic LED grow lights: SF-ONE™, SF-PRO™ AND SF-MAX™

Gourma Chooses Sollum Technologies’ Fully Dynamic LED Lighting Solution

William Attardi on April 9, 2025

Sollum® announced its partnership with Gourma, a leading fine herb grower based in Saint-Norbert, Québec. Gourma offers 25 potted herb varieties, including nine that are certified organic. These aromatic herbs are distributed across Québec in the produce sections of grocery retailers, reflecting the quality and reach of their greenhouse production. In early 2023, Gourma undertook a major brand repositioning, doubled its production area, and adopted a forward-thinking vision focused on innovation. With the integration of Sollum’s dynamic LED lighting solution, the company is now making a significant shift towards a fully controlled and adaptable lighting environment. This collaboration will enable Gourma to precisely tailor lighting conditions to the specific needs of its herbs, influencing key factors such as morphology, colour, and flavour. https://www.ledinside.com/news/2025/4/2025_04_09_04

DLC Updates its Technical Requirements for LED-Based Horticultural Lighting

William Attardi on March 14, 2025

A new version of the DesignLights Consortium’s (DLC) Horticultural Lighting Technical Requirements released today strengthens efforts to improve the efficacy and quality of LED products used in the controlled environment agriculture (CEA) industry. Taking effect April 18, 2025, the DLC’s new requirements come at a time of burgeoning growth in the CEA sector. Valued at $7.8 billion last year, the global CEA market is expanding at a compound annual growth rate of 12.2 percent and expected to reach $22 billion by 2033, according to a February 2025 market research report. With lighting being the largest operational expense in CEA facilities, there are significant opportunities to increase energy efficiency and cost savings with the right lights. [News] DesignLights Consortium Updates its Technical Requirements for LED-Based Horticultural Lighting – LEDinside

Sollum Technologies and Leaficient Introduce the First Plan-Responsive Dynamic LED Lighting Solution

William Attardi on March 8, 2025

Sollum Technologies and Leaficient are pioneering a breakthrough technology that redefines how LED lighting adapts to plant growth. Today’s traditional lighting strategies rely on Daily Light Integral (DLI) as the primary metric for optimizing plant growth, based on the premise that plants absorb and use light with the same efficiency throughout the day and at all growth stages. However, recent research has shown that plant productivity can change significantly based on a myriad of factors relating to the environment, resources provided and internal biological processes. In response, Sollum and Leaficient are collaborating to develop the first closed-loop, plant-adaptive dynamic lighting system, which adjusts lighting in real time based on plant productivity and growth rates.  [News] Sollum Technologies and Leaficient Introduce the First Plan-Responsive Dynamic LED Lighting Solution – LEDinside

DLC Draft 1 Horticultural Technical Requirements V4.0

William Attardi on December 31, 2024

The DesignLights Consortium (DLC) has released their Draft 1 Horticultural Technical Requirements V4.0. The draft proposes three updates:

  • Efficacy increase: Hort V4.0 proposes to increase the efficacy threshold to 2.5 μmol × J-1, which is an 8.7% increase over the Hort V3.0 threshold. This will set the DLC efficacy threshold for LED-based horticultural lighting at more than 45% above the most efficacious non-LED option.
  • Removal of lamp categories: Hort V4.0 proposes to remove eligibility for lamps. This decision was made based on low application numbers in lamp categories.
  • Clarifications to various requirements: A variety of clarifications are proposed throughout Hort V4.0, including for definitions of key terminology and for certain testing requirements.

The Draft 1 Horticultural Technical Requirements V4.0 document is available here.

LightNOW: News and Opinion for the Lighting Industry

2024 State of the Cannabis Lighting Market

William Attardi on December 31, 2024

This ninth annual exclusive report takes a deep dive into the fluctuating lighting trends among commercial cultivators. It has been nearly a decade since Cannabis Business Times first began publishing its “State of the Cannabis Lighting Market” report. There’s no doubt that the relationship between cannabis and light is one of the most crucial aspects of cannabis cultivation and ultimate success. From light intensity to spectral properties, to light uniformity, to dimming technology and much more, every new discovery in the cannabis industry opens another door for growers, researchers, and lighting manufacturers to explore. In this 2024 “State of the Cannabis Lighting Market” report, you’ll find exclusive data revealing practices of your cannabis cultivation peers, with valuable insights into the evolution of cannabis lighting trends through the years.

The Statue of Liberty was made with copper but due to oxidation, it turned green.

When the “Lady in the Harbor” first arrived in New York in 1886, she didn’t look like the mint-green icon we know today. In fact, for the first twenty years of her life, she stood as a towering, metallic beacon of reddish-gold. Designed by French sculptor Frédéric Auguste Bartholdi and engineered by Alexandre Gustave Eiffel, the statue was a gift from France to America. To build her, Bartholdi chose copper for three practical reasons:

  • Malleability:It could be hammered into elaborate, thin sheets.
  • Weight:Copper is lighter than stone or bronze, making it easier to ship 350 individual pieces across the Atlantic.
  • Durability:It was strong enough to survive a 27-day ocean voyage and the harsh winds of the harbor.

When she was unveiled on October 28, 1886, her skin—made of 300 copper sheets roughly the thickness of two pennies—shone with a bright, metallic brown luster. The transformation from “penny-colored” to “patina-green” wasn’t planned. Bartholdi actually expected the statue to age into a deeper, darker red. However, the unique environment of New York Harbor—a mix of salt air, moisture, and industrial pollution—triggered a process called oxidation.

The Timeline of Change:

  1. 1886–1900:The bright copper dulled into a dark, muddy brown.
  2. 1903:The first hints of a light green crust, or “patina,” began to appear.
  3. 1906:The color change was so controversial that Congress nearly stepped in. They appropriated $62,000 to paint the statue back to its original color, but the public protested, calling the idea “sacrilege.”
  4. 1910–1920:The statue was a patchy mix of brown and green until 1920, when the oxidation was complete, leaving her entirely teal.

While we now view the green color as iconic, it actually serves a vital structural purpose. The layer of verdigris (the green patina) acts as a protective shield. It seals the copper underneath, preventing the metal from further corrosion and weathering.  By the time the color fully changed, a new generation of immigrants had arrived in America seeing a green statue.