The Design Lights Consortium (DLC) has introduced significant updates in its specifications from DLC 5.0 to DLC 5.1, which primarily focus on improving lighting quality, energy efficiency, and controllability.
1. Color Quality and Consistency
- DLC 5.1 emphasizes better color display levels, requiring improved color consistency and quality across products. This includes new chromaticity and color rendition requirements.
- DLC 5.0 had no stringent requirements on lighting color quality, focusing mainly on improving the overall lighting effect.
2. Dimming Requirements
- All products under DLC 5.1 must have a dimming function, enhancing energy savings and user safety. This is a significant shift as many non-dimmable fixtures listed under 5.0 will not qualify under 5.1.
- DLC 5.0 required dimming for most indoor lamps but did not mandate it for all products.
3. Requirements for Effectiveness
- DLC 5.1 introduces a base efficacy requirement for all products, ensuring that they meet a minimum level of energy efficiency to be listed on the Qualified Products List (QPL).
- In contrast, while DLC 5.0 increased efficacy requirements compared to its predecessor (v4.4), it did not enforce a universal base efficacy standard.
4. Glare Performance and Distribution of Light
- The newer version also includes improved glare performance criteria and additional light distribution requirements, aiming to enhance user comfort in various environments.
- These aspects were less emphasized in DLC 5.0, which primarily focused on energy savings without specific glare or distribution guidelines.
5. Transition and Compliance
- The transition from DLC 5.0 to DLC 5.1 has resulted in many older products being delisted; approximately two-thirds of the fixtures listed under v5.0 may not meet the new standards.
- Manufacturers were required to submit additional testing information to comply with v5.1 by April 2022, ensuring that products meet the updated specifications for continued listing.
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Summary
In summary, DLC 5.1 builds upon the foundation established by DLC 5.0 by enhancing requirements related to color quality, dimming capabilities, efficacy standards, glare performance, and light distribution. These changes reflect a broader commitment to improving the overall quality of LED lighting while promoting energy efficiency and user satisfaction in commercial lighting applications.
