May LightHouse Education Program: Causes of Excess Color Changes in Streetlights
May 10 @ 12:00 pm - 1:00 pm
Over the last couple of years, there have been numerous reports of excessive color changes in streetlights resulting in a change from white to colors that are well off the Planckian Locus (e.g., purple, blue). This presentations covers an examination of 28 LED light engines taken from warranty replacements of field products that exhibited visually excessive color changes. These LED light engines were characterized using a combination of visual, photometric, and thermal measurements, and the root cause of the gross color change was identified and will be discussed.
Free for Members & Guests
Points to be Discussed
- Different LED packages used in lighting
- Representing color changes in LEDs using chromaticity diagrams
- Findings from warranty returns
- Color changes in LED packages – from white to purple to royal blue
- What can manufacturers, designers, and specifiers do to keep this from happening
- Q&A will follow at end of presentation
About the Speaker
Dr. J. Lynn Davis is an independent consultant that has had a lengthy career in lighting and electronics technology development and has worked on new materials for advanced radio communications, tunable white lighting technologies, and the reliability of solid-state lighting devices. He is a member of the IES Testing Procedures and Lighting for the Aged and Partially Sighted Committee. He is as a member of multiple committees for the Illuminating Engineering Society (IES) and a senior member of the Institute for Electrical and Electronics Engineering (IEEE).
Dr. Davis has more than 50 publications and has been granted more than 50 U.S. patents.
Registration
Registration is free for members and guests.