New DLC Policy: Horticultural Technical Requirements V1.2

LDS 7 CS DLC 400

Oct 23, 2019

The DLC is updating two aspects of its requirements for horticultural lighting products, effective October 21, 2019. These updates support the industry transition from traditional lighting data and metrics to horticultural lighting data and metrics that better represent horticultural lighting performance.

The V1.2 requirements do not include specifications for DC-powered fixtures. The DLC will continue to work to improve and expand the range of energy-saving LED-based fixtures available to the horticultural market through future specification revisions.

1. Revision to flux maintenance policy

As previously described in past DLC horticultural program revisions and on the DLC website, the DLC will begin requiring flux maintenance data denominated in horticultural-specific units, and will no longer accept lumens or radiometric watts LM-80 or LM-84 reports starting on October 21st, 2019. The DLC has been in close contact with LED device manufacturers, and is confident that the industry is prepared to transition away from legacy performance extrapolation data denominated in humanvision terms.

Products which have previously been approved and listed with legacy terms will remain temporarily qualified and listed on the DLC’s Horticultural QPL. Those which used non-PPF terms, and did not provide a static conversion factor to PPF terms, will be asked to provide updated PPF-based information in the period from October 2019 to April 2020. Any product that does not provide this updated flux maintenance information will be delisted in April 2020. All QPL listing updates are scheduled to take place at the end of the update period in April 2020. Manufacturers of products that have been provisionally qualified will be contacted with a means to update their product performance to avoid delisting.

2. Revision to TM-33 requirements

The DLC originally proposed to require PPID and SQD information in the TM-33 document format starting in October 2019, to replace its current position of requiring this information in a nonstandardized graphical format. While use of this document is increasing worldwide, the adoption and production of software tools to work with the TM-33 format are not yet widespread enough for the DLC to require its use at the planned time. Thus, the DLC is delaying its required implementation

3. DC-powered fixtures to remain ineligible in Version 1.2

The Draft Version 1.2 originally included a proposed technical methodology that would make DCpowered fixtures eligible for DLC qualification. The DLC received feedback during the comment period that the proposed methodology would not provide sufficient accuracy to represent the expected performance of these products. For the V1.2 Horticultural Lighting Requirements, DCpowered fixtures will remain ineligible. The DLC will continue to investigate this category of horticultural lighting products and may expand the specification to include them as part of future specification revisions.

View Horticultural V1.2 Technical Requirements

View Horticultural Revision Cycle Timelines

Source

Related Articles


Changing Scene

  • July 10, 2025 - Mac’s II Agencies Announce Addition to Project & Specification Sales Team

    Mac’s II Agencies Announces Addition to Project & Specification Sales Team

    Mac’s II Agencies is pleased to announce that Drazen Jerkovic will be joining their Project & Specification Sales team in the Lighting Division later this fall. With over 25 years of experience in the lighting and electrical industry, Drazen is a highly respected consultant known for his technical knowledge and deep understanding of project delivery. His recent role… Read More…

  • Noramco-Announces-Samantha-Boernsen-as-New-Regional-Sales-Manager-Winnipeg

    Noramco Announces Samantha Boernsen as New Regional Sales Manager, Winnipeg

    Please join Noramco in welcoming Samantha Boernsen as Regional Sales Manager, Winnipeg! Samantha brings a wealth of experience in the electrical industry, with a strong focus on lighting, marketing strategy, and customer engagement. She has built her career on connecting technical expertise with real-world application, making her a trusted partner to clients and colleagues alike.… Read More…


Design

  • What You Need to Consider When Choosing Data Center Lighting

    What You Need to Consider When Choosing Data Center Lighting

    When operating a data center, the lighting syst​em is often not the most concerned part. Actually, lighting system performance directly influences whole electricity consumption and operating costs, especially in a 24-hour non-stop data center. This article will delve into the key factors to be considered when choosing data center lighting. For enterprises that are planning to… Read More…

  • Artika: 5 Advantages of Smart Lighting

    Artika: 5 Advantages of Smart Lighting

    Lighting is arguably one of the most important features of any home. Too bright, and it can be abrasive, increasing your sensitivity to light. Too dim, and it hides the unique characteristics of your home and can have adverse effects on your mood. When you design your home, the type of lighting and fixtures you… Read More…


New Products

  • BOLD: Prism Recessed Outdoor Fixture – RL-PRISM-60-BK

    BOLD: Prism Recessed Outdoor Fixture – RL-PRISM-60-BK

    The Prism is part of BOLD’s high-end, durable, and modern 60mm (2 3/8″) recessed fixtures. With its 93 CRI, hexagonal design, partially covered light source, and 360-degree warm glow, you can create unique ambient lighting effects and modern designs, minus the glare. You can safely walk or drive over these raised recessed lights: their low-profile… Read More…

  • Beta-Calco: Micro Squiggle – Suspended Continuous Lighting System

    Beta-Calco: Micro Squiggle – Suspended Continuous Lighting System

    The Micro Squiggle is a highly customizable curvilinear lighting system, which features a sleek 1-inch aperture and integrates seamlessly with architectural design. With a variety of curves, straight sections, and joiners, it allows you to create unique configurations that wrap around structural elements, enhancing the space’s architectural expression while meeting your specific design needs. Micro… Read More…