An Overview of DLC Version 5.1
What is DLC v5.1?
DLC Version 5.1 is a new set of technical requirements outlined in the Solid State of Lighting (SSL) — a policy that ensures a higher quality of light color. DLC v5.0, passed in 2020, laid the groundwork for v5.1 with the ultimate goal of maximizing energy savings. The latest updates in DLC v5.1 focuses primarily on color performance, discomfort glare, and light distribution. The DLC certification body says this latest round of requirements is designed to improve satisfaction and comfort for the user. Although the efficacy (measured in lumens per watt) is the same between v5.0 and v5.1, v5.1 should enable greater energy savings because of better dimmability and controls. Products that do not meet v5.1 requirements have already been removed from the Qualified Products List (QPL). Here is an outline of the changes and how they may affect your lighting:
1. Color maintenance requirements
Color consistency with LEDs has been a problem for quite some time. Although manufacturers have made major improvements, the new DLC policy focuses on improved color rendering and color consistency over time. The requirements include enhancements for spectral quality and light distribution. The ultimate goal is to improve productivity, performance, comfort, mood, safety, health, wellbeing, and more.
2. Dimmability
Almost all products that meet v5.1 requirements are now dimmable and must report on integrated controls. Dimmability is an essential part of saving energy and offers more comfortable light levels.
3. Improved glare performance
Once again focused on improving the experience of lighting products, DLC v5.1 also improves glare performance and reduces discomfort. The glare performance is based on light distribution and is designed to help you choose the right product when you're thinking about installation.
How DLC v5.1 will affect lighting product and rebate?
The latest requirements mean that two-thirds of the current DLC list will be removed. While there are still more than 200,000 products on the list, this is a significant overhaul. The product that's impacted the most is mogul-based HID replacement lights (you may have heard these called corn cobs). About 80% of LED HID replacement products are now removed from v5.1. But what about rebates? Will products not on the list still qualify for rebates? This will vary from utility to utility, but typically rebates require products with the most recent DLC listing. There may be a grace period, so it's always important to check to make sure you're selecting the right products for rebates.
Guiding DLC updates and lighting purchase
You can probably tell that the lighting industry and its certification groups want you to be informed and careful when choosing lights or fixtures. What type of product are you installing? What is its proper rating and intended application? Where is it being used? What is the warranty and expected life? These are all questions that DLC wants you to ask as you look at your lighting project. Through proper research and partnership, your project could offer a beneficial return for years to come.
Post time: Feb-13-2023
