October 29, 2019

DLC Officially Released Draft V5.0 Second Edition

DLC Officially Released Draft V5.0 Second Edition

The Version 5.0 revision is the first of a series of specifications designed to improve the quality of light and connectivity of DLC listed products. As a whole, Version 5’s quality of light and controllability metrics will help ensure only high-quality products are listed, superior performing products can be differentiated, and additional energy savings are realized.
The initial draft Technical Requirements laid out the DLC’s broad vision for improving the quality of light and controllability of products. Draft 2 will focus on implementing these requirements on a timeline that aligns with industry development cycles and current research.

This article outlines the updates and timelines of DLC v5.0 Second Edition.

The core points of this update:
1) The efficacy of listed products increases by an average of 10.8%, up to 23%.
2) All listed indoor luminaires, with some exceptions, are dimmable, providing increased energy savings and user satisfaction.
3) The color quality requirements help provide people the lighting they want with better consistency over time.
4) Lighting decision makers can use DLC Premium to have better confidence in regards to the glare performance of listed products.

Specific Updates

01 Time schedule for DLC V5.0 implementation

DLC still plans to release the final version of the standard in January 2020, to be implemented in April. This timeframe has not changed.

If the time of Final V5.0 Requirements Released is T,
 Within T + 3 months, manufacturers can still apply for DLC with V4.4 , and then stop accepting V4.4 applications after this time.
 T + 9 months is the deadline that manufacturers submit the updates for original V4.4 products that light efficiency, dimming and glare do not meet V5.0
 T + 12 months, the products that do not meet the V5.0 efficacy, dimming and glare where applicable requirements, are delisted.
 T + 15 months, deadline for submitting other updates for V5.0
 T + 18 months, products that do not meet the complete V5.0 technical requirements are delisted.

 If the products’ parameters such as light efficiency do not meet V5.0, it is necessary to rectify, retest and resubmit updates.
 If the performance of the luminaires meets the requirements of V5.0, submit the relevant information.
 For additional parameters such as flicker, add test.

02 Efficacy Increase

The efficacy of listed products increases by an average of 10.8%, up to 23%.
Compared with the first draft, the efficacy requirements for some products have been increased , and this draft has issued DLC premium efficacy requirements.

03 Quality of Light

 The standard version requires color coordinates to meet the 7-step requirements;
 For Outdoor products, CRI, Ra increases from 65 to 70, and other categories remain unchanged;
 Indoor products’ color maintenance needs <=0.004, Outdoor and Highbay’s color maintenance need <=0.007;
 DLC premium Indoor products’ color coordinates need to meet the 4-step requirements;
 DLC premium Indoor products’ color maintenance needs <=0.002, Outdoor and Highbay’s color maintenance need <=0.004;
 Removed the requirements for uniformity of color space (color uniformity within the angle of illumination of the space)
 Removed the requirements of color consistency (color consistency between different samples of the same model);
 Requirements that are not related to color quality have been removed (for example, physiological health requirements for light).

04 Light Distribution and Glare

 The light distribution requirements are unchanged from the first edition;
 Glare parameters are only required for DLC premium products:
1) Troffer and Linear Ambient < 19;
2) Low-Bay < 22;
3) High-Bay < 25;
4) No requirement for other products
 UGR parameters are not displayed on QPL

05 Flicker

Cancel the limit requirements of Pst and SVM;
All four flicker parameters are available with test values, and all of them have no limited requirements.

06 Controllability

 Indoor luminaires and retrofit kits must be continuously dimmable, excluding case lighting and specialty hazardous. All other products are required reporting of dimming capability;
 Report control function;
 Report dimming methods.

07 DLC Premium

DLC this draft publishes DLC premium parameter requirements:
1) The efficacy is increased by 15lm/W based on the standard version;
2) The color coordinates satisfy the 4-step requirements;
3) For Indoor products except for High-bay, color maintenance <=0.002, Outdoor and High-bay products <=0.004;
4) Glare, see the glare parameter requirements;
5) Controllability. All products must be capable of continuous dimming.

08 Allowances

When applying for DLC, in addition to the allowance (for example, the efficacy tolerance -3%), there are allowances:
1) Color temperature <= 2700K, efficacy tolerance -5%;
2) Indoor except High-bay, Option 1 efficacy allowance -5%, Option 2 efficacy allowance -10%; Outdoor and High-bay, efficacy allowance -5% (If the products respectively meet the CRI requirements in the table, the corresponding allowance can be applied);
3) Glare. The products meet the corresponding requirements and can be applied to -10% of the efficacy allowance.

09 Tolerances

1) Stay the same:
 Light output ±10%;
 Efficacy -3%;
 Allowable CCT.
2) Delete:
 PF -3%;
 THD +5%.
3) Increase:
 CRI -1point;
 Color Maintenance +0.0004;
 UGR +1;
 Beam angle -5°.

10 PF and THD

This draft proposes to remove the total harmonic distortion (THD) and power factor (PF) requirements.

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