A New Tool for Projecting Long-term LED Chromaticity Stability

Recorded On: 03/26/2026

About this Course and Tool

The IES offers Educational Webinars throughout the year, purposefully spanning a broad range of topics and speaker expertise.

Description: In many applications — such as retail and museum lighting — a characterization of anticipated chromaticity shift of SSL products over their usable lifetime is critical to long-term lighting quality. Chromaticity coordinates of some light sources can change significantly from their initial values over time.

ANSI/IES TM-35-19(R25) Technical Memorandum: Projecting Long-Term Chromaticity Coordinate Shift of LED Packages, Arrays, and Modules recommends a method of projecting the shift in chromaticity coordinates of LED packages, arrays, and modules using data obtained during ANSI/IES LM-80 testing.

This webinar introduces a new IES Excel tool developed by the IES Testing Procedures Committee which can be used by designers and manufacturers to project this shift.

Note: The March 26th IES webinar, which also serves as the video overview for ANSI/IES TM-35-19(R25), will be posted to this eLearning module on or before April 6, 2026. Please return to review the recording.

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COMING SOON: Webinar ANSI/IES TM-35 Overview

ANSI/IES TM-35-19(R25) Excel Tool

TM-35-19(R25) Excel Tool

Open to download resource.

Open to download resource. This tool was developed by the IES Testing Procedures Committee, per ANSI/IES TM-35-21. It may be used by designers and manufacturers to project this shift. This file may not be transferred, shared or distributed. Individual registration is required per user.

You must register to access.

CEU Certificate of Completion

Certificate

1.00 CEU credit | Certificate available

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Jonathan Vollers

Senior Manager of Compliance & Testing

Musco Sports Lighting

Jonathan is Lighting Certified and holds a Bachelor of Science in Mechanical Engineering along with a Master of Business Administration. After spending 15 years in the aerospace industry, he transitioned to the lighting industry in 2012, bringing with him a strong foundation in engineering rigor, testing, and quality systems.

Since then, Jonathan has led multidisciplinary efforts spanning photometry and reliability laboratories, electrical and mechanical prototyping, safety compliance, and performance validation for solid-state LED lamps and luminaires. His work supports compliance with domestic and international safety standards, as well as key performance programs such as DesignLights Consortium® and DarkSky International.

Beyond his technical leadership, Jonathan actively contributes to the advancement of the lighting industry. He teaches Fundamentals of Lighting, presents on critical industry topics, and supports several professional organizations, including the NEMA Lighting Sections, the IES Testing Procedures Committee, and the NCQLP Test Examination Committee—all while continuing his impactful work at Musco Sports Lighting.

Jonathan Vollers, LC

Eric Bretschneider

Eric Bretschneider has spent his entire career working in the field of high brightness LED. Over the course of the last 30+ years he has worked in the industry at every stage of LED production from MOCVD hardware/process design all the way through to fixture/luminaire design and manufacturing. He is a noted expert in many fields including phosphor conversion, radiometric/photometric measurement of LED packages and fixtures, reliability and IP matters in Solid-State Lighting. Since 2006 he has been a member of the IES Test Procedures Committee and the IES Science Advisory Panel. He is the current technical lead for IES TM-21 and IES TM-28. He also developed the mathematical model used in IES TM-35 for predicting chromaticity shift of LED packages.

He holds over 40 patents related to LED technology and earned his Ph.D. in Chemical Engineering from the University of Florida.