DesignLights Consortium®
Testing Laboratory Requirements
October 22, 2013

The DLC requires that product testing for DLC applications be conducted at an approved laboratory appropriate for the performance being evaluated. These tests include the IES-LM-79-08 Approved Method: Electrical and Photometric Measurements of Solid-State Lighting Products, In-situ Temperature Measurement Tests (ISTMT), and IES-LM-80-08 Approved Method: Measuring Lumen Maintenance of LED Light Sources. For each of these test methods, laboratories must be approved or accredited by organizations knowledgeable of the appropriate testing conditions, testing equipment, and staff competencies necessary for accurate measurements. Below are details regarding the requirements of a laboratory for each of these test methods from which the DLC will accept testing.

DLC reviewers reserve the right to request documentation confirming testing has been conducted by a laboratory that meets these requirements at the time of testing.

Transition Process

The Testing Laboratory Requirements above are effective immediately. Manufacturers may submit testing conducted at a laboratory meeting these requirements in support of a DLC product application at any time moving forward.

Additionally, a grace period will be extended to industry to simplify the complete transition to these new requirements. Test reports from laboratories meeting the previous requirements will be accepted on testing conducted prior to January 1, 2014. Testing conducted after January 1, 2014, will only be accepted if the laboratory meets the new requirements. Note that for LM-80 reports, this means testing started prior to January 1, 2014 will continue to be accepted if conducted by a laboratory meeting the previous requirements.

Transition Schedule

The previous laboratory requirements are included below for reference. Should you have any questions regarding the transition process, please contact


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