U.S. Department of Energy - Energy Efficiency and Renewable Energy

Building Technologies Office – Information Resources

LED Color Stability: 10 Important Questions

This April 15, 2014 webinar examined the causes of color shift, and took a look at existing metrics used to describe color shift/color stability in LED lighting. The lumen maintenance lifetime of many LED products is 25,000 hours or more, but that doesn't mean products are guaranteed to perform the same over that time. One thing that could change is the color of the light, or chromaticity. Presenters Michael Royer of Pacific Northwest National Laboratory, Ralph Tuttle of Cree, and Chad Stalker of Philips Lighting answered questions concerning established tolerances for color shift, current standards that apply to the measurement of color shift, and plans for new methods and/or standards for projecting color shift in the future, among others.

To receive an IES CEU certificate of attendance, please follow these instructions. The course certificate will be available only until May 31, 2014.

  1. Go to https://ies.digitalchalk.com and register your name and required contact info. Fill in all required fields.
  2. Choose your IES section name from the drop down box.
  3. Add "PNLEDColor14" to the Course Number box and click "SAVE".
  4. Add your IES or AIA member number. If you are not an IES member, use "OOO".
  5. After you complete your registration input, click on the Catalog tab.
  6. Look for the course "PNNL Webcast – LED Color Stability: 10 Important Questions".
  7. Add the course to your shopping cart ($5.10).
  8. After the cart process, the course will be listed on the dashboard; click on the IES logo and take the IES Program Survey "quiz".
  9. After completing the survey quiz questions, you will be able to download your IES CEU certificate of attendance.

If you have any problems, or questions about this process, please contact Pat McGillicuddy: pmcgillicuddy@ies.org.