Agriculture, Codes + Standards

DLC Draft 1 Horticultural Technical Requirements V4.0

David Shiller December 26, 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. Stakeholder comments were accepted through 12/19/24.

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