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March 15, 2022

The DLC periodically updates the requirements for listing. Two sets of DLC lighting requirements were introduced in 2020. DLC V5.0 contains new requirements for efficacy. V5.1 adds quality of light requirements, including spectral quality and glare, and controllability:

-- Spectral Quality. The requirements now introduce Color Maintenance for qualification, improved Correlated Color Temperature consistency for a Premium designation, and set new efficacy allowances for great color, among other updates.
-- Light Distribution and Glare. The requirements address beam angle and add a Unified Glare Rating (UGR).
-- Dimmability is redefined as containing a dimmable driver. Or, as a light that can be dimmed by external control signal and is specified as dimmable.

You can review the full V5.1 Standards on the DLC site.
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