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DLC Seeks Comments on Updated Proposed Technical Requirements for4-pin-base LED Replacement Lamps

Dear DLC Members and Stakeholders:

The DesignLights Consortium™ (DLC) issued a first draft of proposed technical requirements for 4-pin-base LED Replacement Lamps (that is, LED replacements for 4-pin-base CFLs) in June. Comments received from that first draft have resulted in a number of changes to which DLC requests additional stakeholder input. The initial proposal is available here, the cover letter accompanying the proposal release is here, and the slide deck from the explanatory webinar is here.

Therefore, DLC is pleased to issue a second draft of technical requirements for 4-pin-base LED replacement lamps for comment. To view the updated proposal, click here.

Comments on this draft proposal will be accepted through October 5, 2016 and should be submitted to info@designlights.org.

Please note that this relatively shortened comment period is due to this being a second draft announcement, and therefore, the expectation is that commenters will be familiar with the original proposal.

An informational webinar will be held to review the contents of the updated proposal at 3:30OM ET on Wednesday, September 21, 2016.

To register for the webinar on September 21 at 3:30PM ET, please click here:


Overview of Changes in the Updated Proposal for 4-pin-base LED Replacement Lamps

Though feedback is welcome on any aspect of the proposal, there are a couple key changes that DLC would like commentary on during this open comment period.

  • Lamp-level testing. Both industry commenters and members expressed concern that lamp-level performance be both assessed and represented on the QPL. Due to the fact that the first draft included only testing in a reference downlight housing, this is an additional LM-79 beyond what was previously proposed.
  • Compatibility testing. Many comments were received during the first comment period pertaining to the compatibility of lamps with CFL ballasts. To better investigate and improve assurance of broader compatibility, DLC is proposing to add several additional tests, as suggested by industry commenters. Details are in the accompanying draft policy, and will need to take place in a lab recognized to do testing for the ENERGY STAR lamps program.
  • Adjusted light output requirements. Intended to reflect the differences in testing between vertically-mounted lamps (single lamp in a fixture) and horizontally mounted lamps (two lamps in a fixture).
  • Clarifications for thermal testing. Language has been amended to clarify that ISTMTs should be conducted in the appropriate thermal environment per UL/CSA 1993.

Additional Notes

Several additional items on which DLC received feedback as part of this comment period are being added to wish lists for potential development, although DLC does not intend to address them as part of the this development process. These include:

  • Additional details and specifics on nuances relating to safety certification
  • Dimming performance
  • Additional lamp categories, including UL Type B 4-pin lamps and 2-pin lamps of all types
  • More granular specifications relating to equivalency between LEDs and CFLs

If you have any questions, please direct them to info@designlights.org.


The DLC Team





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