The Life of an IES File: Predicting Lighting Through Photometry
Recorded On: 09/18/2025
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About this Course
The IES offers Educational Webinars throughout the year, purposefully spanning a broad range of topics and speaker expertise.
Description: Lighting professionals rely on the measurable properties of light to predict performance, communicate value, and make informed design decisions. This webinar explores the fundamental science of photometry and traces the lifecycle of an IES file — from laboratory testing to real-world application. Participants will develop a foundational understanding of how photometric measurements are captured, structured into IES files, and used to simulate, compare, and specify lighting solutions. Designed for a broad lighting audience, this session will help you build or refresh your understanding of photometry to better support accurate predictions and achieve design goals.
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LockedJonathan 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
Michael Grather
President and CTO
LightLab International Allentown, LLC
Michael is President and CTO of LightLab International Allentown, LLC. Previously, he was he was the President of Luminaire Testing Laboratory, Inc. (LTL) for 12 years. Following the acquisition of LTL by Underwriters Laboratories in 2010, Michael became principal engineer (PDE) for lighting performance testing with UL. Michael is a Past President of the IES Lehigh Valley Chapter and is currently a board member of the Council for Optical and Radiation Measurement (CORM). He has been an IES member for 21 years, is a past chair of the IES Testing Procedures Committee and now serves as chair of the Photometry of Indoor Luminaires Subcommittee of the IES Testing Procedures Committee. As a career-long member of the photometric testing community, Michael has been dedicated to the use of light measurement methods to help promote quality lighting and energy efficiency. Michael believes that the IES provides a collaborative platform for the development of standards and educational materials for greater industry consensus and understanding.