DLC News
January 22, 2018

NEW DLC DRAFT POLICIES: Second Draft SSL Technical Requirements V4.3

The DLC is pleased to release a second draft of new and revised Technical Requirements and Testing and Reporting Requirements for categories of solid-state lighting (SSL) products for comment. These revisions are proposed to be added to the Technical Requirements as Table Version 4.3. Comments should be submitted in writing to info@designlights.org and will be accepted through Thursday, February 8, 2018.

The draft V4.3 proposal includes the following expansions and revisions, for which the DLC is seeking comment:

Field-Adjustable Products:

The current DLC dimming policy is being expanded to allow products with field-adjustable lumen output to be listed on the DLC SSL Qualified Products List (QPL). The lumen output of these products can be adjusted by the manufacturer, distributor, or installer before or during installation or commissioning. This allows manufacturers and distributors to capture greater economies of scale and stock fewer SKUs, reducing manufacturing and distribution costs while providing customers greater flexibility. 

The V4.3 Testing and Reporting Requirements prescribe that Field-Adjustable products will be tested at the default setting, as well as the highest power setting, if different from the default. 

  • In this second draft, the DLC has revised definitions of both dimmable and Field-Adjustable products.

Color-Tunable Products:

Color-tunable lighting is a relatively new lighting system capability where the color of a light source can be changed after it is installed and tuned to end user preferences. The DLC is proposing new Testing and Reporting Requirements that would enable high-quality, energy-efficient, color-tunable products to be qualified and listed on the DLC SSL QPL. Color-tunable products are defined by the requirements as products whose Correlated Color Temperature (CCT) can be adjusted via an input control of any type and whose light output provides white light at all input configurations. The requirements include proposals for both White-Tunable and Warm-Dimming products. Full Color-Tunable products are outside the scope of this requirements proposal and are presently ineligible for listing.

The DLC requests feedback on the following items:
  • With this draft, the DLC has proposed Color Tuning Testing and Reporting Requirements for Duv in accordance with ANSI C78.377-2017 Extended Specification, which allows Duv below the ANSI basic spec quadrangles, but not above. This is more restrictive than the proposal of the initial draft, which defined white light as points within Duv magnitudes of 0.012 of the blackbody locus in the CIE 1976 color space. Please provide feedback outlining any potential suppression of emerging technologies or product limitations incited by this new change. Assuming this policy version does not intend to define circadian or wellness-based products, describe the achievable balance between a baseline quality of light output and technological opportunities.
  • The DLC has proposed to change the terminology of the previous draft from “Dim-to-Warm” to “Warm-Dimming”. Please provide any relevant feedback on this update.


3-foot, 8-foot, and 2G11-Base Replacement Lamps: 

The DLC is proposing an update to the replacement lamp product category with new Testing and Reporting Requirements that would enable 3-foot and 8-foot linear replacement lamps, and 2G11-Base LED replacement lamps, to be qualified and listed on the DLC SSL QPL. Including these lamps will facilitate efficiency program rebates/incentives to be paid on high quality and energy efficient LED replacements in more applications, such as 3-and 8-foot commercial strip fixtures and 2x2 luminaires designed for lamps with a 2G11 base, also known as T5 twin-tube compact fluorescent names and trade names PLL and Biax.

The DLC has made the following key changes from the prior draft and requests input on the following items:
  • Due to the dimensional limitations of goniophotometers, the proposed requirements for eight-foot lamps in this draft outline a scaling methodology utilizing a four-foot lamp of “identical construction” to half of the 8-foot lamp, which is defined as having identical cross-section construction, including having the same type and quantity of driver(s) at same drive current, same number of LEDs or LED boards, LED layout, spacing, plastic tube material, thickness, and heatsink material and extrusion. The DLC is looking for feedback on what tolerance should be allowed when comparing the LED/ PCB “layout” of the “identical” lamp to the lamp it represents. Could a coordinate system be utilized for comparative measurements? How else might tolerances be defined for the utilization of the four-foot “identical” lamp that would maintain the accuracy of the scaled candela values using the methodology proposed?  Define the point at which differences in layout are, or are not negligible.
  • Based on the dominant application of 2G11 lamps, eligibility has been expanded to include a wider range of UL Types and ballast compatibility testing has been eliminated. As compared to the initial draft proposal, the required initial lumen output for 2G11 lamps has increased and eligibility has been limited by the lamp length appropriate for the reference housing and intended application. The DLC is looking for the following feedback: are there any specific concerns to allowing all UL types for 2G11 replacement lamps? Are the physical and lumen performance characteristics appropriate for limiting eligibility to the intended application? 
If you have any questions about the draft requirements outlined above, please email info@designlights.org. We appreciate your comments and feedback and look forward to engaging with you as we continue to develop these requirements.