Testing Lab Requirements

Testing Lab Requirements

DLC applications require test results that are issued from an accredited laboratory. Product testing must be conducted at an accredited laboratory appropriate for the performance being evaluated. Additionally, LM-80 test results will only be accepted from laboratories listed as EPA-Recognized Laboratories for LM-80. These tests include:

  • In-situ Temperature Measurement Tests (ISTMT)
  • IES-LM-79-08 Approved Method: Electrical and Photometric Measurements of Solid-State Lighting Products
  • IES-LM-80-08 Approved Method: Measuring Lumen Maintenance of LED Light Sources
  • IES-LM-84-14 Approved Method: Measuring Luminous Flux and Color Maintenance of LED Lamps, Light Engines, and Luminaires.
  • Compatibility testing for four pin-base replacement lamps for CFLs

For each of these test methods, laboratories must be approved or accredited by organizations that can ascertain appropriate testing conditions, testing equipment, and staff competencies necessary for accurate measurements.

In situ Temperature Measurement Test (ISTMT)

The DLC will accept ISTMT results from laboratories meeting at least one of the following requirements:

  • Approved by OSHA as Nationally Recognized Testing Laboratories (NRTLs). View a list of OSHA NRTLs.
  • Approved through an OSHA NRTL data acceptance program or OSHA Satellite Notification and Acceptance Program (SNAP).
  • Accredited for ANSI/UL 1598 or CSA C22.2 No. 250.0-08, including Sections 19.7, 19.10-16, by an accreditation organization that is an ILAC-MRA Signatory.

These requirements are applicable for laboratories conducting both LED ISTMTs and Driver ISTMTs.


The DLC will accept LM-79 results from laboratories that comply with the DLC LM-79 Testing Lab Requirements. A list of DLC approved labs is maintained here. Testing must be conducted within the accreditation effective and expiration dates detailed for a given laboratory. 

The following are acceptable accreditation organizations for LM-79 testing labs:

More information regarding acceptable accreditation bodies, including how additional organizations can be added to the list above, is available in the DLC's LM-79 Testing Lab Requirements.

View List of DLC Approved LM-79 Testing Labs


The DLC will accept LM-80 results from laboratories listed as EPA-Recognized Laboratories for LM-80 at the time of initial application review.

Note: DLC refers to ENERGY STAR Program Guidance Regarding LED Package, LED Array and LED Module Lumen Maintenance Performance Data Supporting Qualification of Lighting Products when determining applicability of LM-80 data for submitted products.

View the list of EPA-Recognized Laboratories for LM-80 here and filter the "Area of Recognition" column by "LED package, module or array (IES LM-80-2008)."


The DLC testing requirements may include LM-84-14 if you choose Option 2 for Lumen Maintenance Determination. DLC will accept LM-84 results from laboratories that meet both of the following:

  • Listed in the DOE LED Lighting Facts® Approved Testing Laboratories List under LM-79 sections 9, 10, and 12
  • Accredited for LM-84-14 by an accreditation body recognized by LED Lighting Facts.

Testing must be conducted within the accreditation effective and expiration dates detailed for a given laboratory. To find the LED Lighting Facts Approved Testing Laboratories List, visit: www.lightingfacts.com/approvedlabs


Compatibility Testing for Four Pin-Base Replacement Lamps for CFLs

As of November 1, 2016, four pin-base (G24q and GX24q) LED replacement lamps for CFLs are eligible for qualification on the DLC QPL. Within the policy for qualifying these types of products, compatibility testing is prescribed that must be conducted at test labs recognized by the ENERGY STAR program for testing lamps. To view a list of acceptable testing laboratories, please refer to the ENERGY STAR Lighting Labs list, and filter for labs approved to conduct testing on "Solid State LED Lamps."

See the Testing and Reporting Requirements for Four Pin-Base Replacement Lamps for CFLs for more information about required testing.


Please note that the DLC does not endorse any laboratory meeting these requirements. Laboratories expressing the ability to qualify products and laboratory test reports that indicate product performance meets DLC Technical Requirements do not represent official DLC product qualification. All decisions regarding product qualification are made by the DLC. DLC reviewers reserve the right to request documentation to clarify testing conditions or to confirm testing has been conducted by a laboratory that meets these requirements at the time of testing.

Please review the FAQs page for additional policy clarifications.