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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

Final Version of DesignLights Consortium’s New Technical Requirements for LED Lighting Released

William Attardi on November 4, 2025

The SSL V6.0 and LUNA V2.0 Technical Requirements are now combined in a single set of technical requirements and scheduled to take effect in January.

Key updates to SSL V6.0 include:

  • A major revision to the DLC Premium product classification for luminaires with higher efficacy thresholds and more rigorous requirements for controllability, expanding the classification to further enable incentives for advanced controls and integrated building systems.
  • Provisions to drive wider adoption of controls through compatibility-based product selection from the SSL and Networked Lighting Controls (NLC) QPLs.
  • Expanded SSL QPL eligibility to support sustainability, lighting innovation and flexible installation practices.
  • Clear criteria and improved documentation for manufacturers and specifiers.

Overall, the new technical requirements for LED lighting maintain an average increased efficacy threshold across all DLC qualified product types of 14 percent (with some product efficacy increases as high as 19 percent). At the same time, recognizing that efficacy must accompany quality to support long-term energy savings and user satisfaction, SSL V6.0 includes efficacy allowances for products that meet higher quality of light thresholds in terms of features such color rendition and glare control. Full details of SSL V6.0 and LUNA V2.0 are available the DLC’s website 

DesignLights Consortium Seeks Self-Nominations for Industry Advisory Committee Members

William Attardi on August 22, 2025

The DesignLights Consortium today announced it is accepting self-nominations through October 3 from lighting industry representatives interested in serving on the DLC Industry Advisory Committee (IAC). An advisory body that meets quarterly, the IAC supports the mission and strategic direction of the DLC to promote the adoption of quality lighting and controls technology through education, collaborations, and expertise. Its activities include consideration of DLC business updates, programs to enhance lighting quality, utility lighting program participation, and ongoing opportunities, challenges, and potential risks related to advancement of energy-saving lighting technologies. The DLC is seeking new members for a two-year term that begins the third quarter of 2025 from the following organization types:

    • Small lighting manufacturers (companies with fewer than 250 employees, with product(s) listed on the DLC’s Solid-State Lighting or Horticultural Qualified Products Lists)
    • Lighting specifiers, including designers, energy service companies, consulting engineers and integrators
    • Lighting distributors.

The DLC is gathering self-nominations through an online form, must be submitted by October 3.

DesignLights Consortium Opens Comment Period for Second Draft of Technical Requirements for LED Lighting: SSL V6.0 & LUNA V2.0

William Attardi on July 28, 2025

The DesignLights Consortium (DLC) today released the second draft of major updates to its Solid-State Lighting (SSL) technical requirements for indoor and outdoor non-residential LED lighting, as well as revisions to LUNA, a dark sky solution. Draft 2 will have a six-week comment period through September 5.  Reviewers can provide feedback via email to comments@designlights.org using the comment form. The final policy will be released in early November. Other changes in Draft 2 reflect feedback the DLC received from stakeholders relative to clarifying various aspects of the technical requirements. These changes are meant to streamline the qualification process for manufacturers while advancing the essential goals of SSL V6.0 and LUNA V2.0. Full details of all proposed revisions are available on the DLC’s website.

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

 

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

Memo: Clarifications to the NLC 2020 Report – 2025 update

William Attardi on February 22, 2025

 “Energy Savings from Networked Lighting Control (NLC) Systems With and Without LLLC”  Key updates include refined clarification of the definition of luminaire-level lighting controls (LLLC) used in the report, elaborated explanations on several important aspects of the control savings factors (CSFs), and distinguishing the calculation methodology between high-end trim savings and other control strategies (occupancy sensing and daylight harvesting). The memo emphasizes that the documented CSFs reflect average savings across a diverse set of projects, where optimal programming varied, and highlights considerations for small sample bias in evaluations. Building-specific CSFs and their limitations are explained, and the memo differentiates findings from a related redesign study to avoid misinterpretation. Lastly, an updated executive summary and errata sheet correct clerical errors, reaffirming that NLC systems with LLLC offer higher energy savings potential but encouraging ongoing updates as technology and datasets evolve.

The Value of Dimming by Levin Nock

William Attardi on January 9, 2025

It’s easy to see the energy benefits of dimming: the more an LED fixture is dimmed, the less electricity it uses. In terms of future-proofing the energy savings of lighting projects, the longevity of LED products makes it paramount to strengthen requirements for dimmability and other lighting control strategies now, since LEDs installed today are expected to work for a decade or more. The latest version of the DesignLights Consortium’s (DLC) Solid-State Lighting (SSL)Technical Requirements stresses the importance of dimming as a way to increase energy savings, while allowing occupants of offices, conference rooms and other spaces to adjust light levels to their comfort or needs. All LEDs are inherently able to dim and nearly 100% of DLC-listed fixtures are dimmable. Expanded adoption is the necessary next step to capturing the benefits of dimming. The Value of Dimming | EC&M

TRAINING: How to Design a Lighting Control System by C. Webster Marsh and Craig DiLouie

William Attardi on December 31, 2024

Based on EE105: Lighting Control System Design, a new course in the Lighting Controls Association’s Education Express program provides detailed information about designing an effective lighting control solution. In Part 1 of this Lighting Controls System Design series, we learned about key documentation including the Content Intent Narrative (CIN), Sequence of Operations (SOO), and Owner Project Requirements (OPR). The next step in design development in Part 2, is to turn these requirements and conceptual design into a realized design. In Part 3 of this series on how to design a lighting control system, we will discuss installation and post-occupancy. You will learn about bidding, responding to questions from installers, reviewing submittals and defending your design, following-through with the installation of the equipment, functional testing, training essential staff, and ultimately ensuring the owner is satisfied. How to Design a Lighting Control System

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

The Genesis of the U.S. Space Force – On December 20, 2019, President Donald Trump signed the National Defense Authorization Act (NDAA) for Fiscal Year 2020, officially creating the United States Space Force, a new and independent branch of the U.S. military. The establishment of the Space Force marked a historic shift in how the U.S. views and manages its military operations in space, reflecting the growing importance of space as both a domain of strategic competition and national security. The Space Force is tasked with ensuring the U.S. maintains its superiority in space, focusing on both the defense of space assets and the development of offensive capabilities. Its mission includes:

  1. Space Operations: Overseeing space-based systems, such as satellites, that provide essential services to the U.S. military, including communication, reconnaissance, and missile defense.
  2. Space Security: Protecting U.S. space infrastructure from threats, including anti-satellite weapons, cyberattacks, and other potential forms of disruption by adversarial nations.
  3. Space Research and Development: Developing and deploying cutting-edge space technologies, including space-based defense systems, that ensure the U.S. maintains an edge in space exploration and military operations.
  4. Supporting National Defense: Integrating space capabilities into broader national defense strategies, ensuring that U.S. forces can operate effectively in space as part of a multi-domain approach to warfare.

The Space Force is designed to streamline and strengthen the U.S. military’s space operations, which were previously under the purview of the U.S. Air Force. By separating space operations into a distinct branch, the government hoped to increase focus on space as a critical area of national defense and enhance the U.S. military’s ability to respond to emerging threats. Source: Day in History