Advances in Characterizing Color Rendition of Light Sources

Hosted By: Color Technical Group

9 March 2021, 12:00 - 13:00 - Eastern Daylight Time (UTC - 04:00)

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Light source spectrum is one component of lighting quality. Among other attributes, spectrum influences the color appearance of objects, rendering objects with more or less saturation, shifting their hue, and/or increasing or decreasing their lightness. The pattern and regularity of these varying shifts can be predicted, which is important because the color shifts can be desirable or undesirable depending on the circumstance. This webinar, hosted by the OSA Color Technical Group, will begin with a description of the theoretical and practical considerations that are important when characterizing how light sources render object colors. Our presenters, Kevin Houser and Michael Royer, will then describe TM-30-18: IES Method for Evaluating Light Source Color Rendition, including the characterization of average color fidelity and color gamut, and hue-specific changes in chroma, hue, or fidelity. Recommended specification criteria for different end-use applications will be explained and demonstrated, including a summary of the research that led to the consensus recommendations. Attendees will become knowledgeable in interpreting the numerical and graphical output from TM-30-18 and understand how the measures can be used to predict and design for human perceptions.

What You Will Learn:

  • Theoretical and practical considerations important for any system intended to characterize light source color rendition
  • The conceptual framework for TM-30-18 as a system for evaluating light source color rendition
  • The components of TM-30-18, including the fidelity and gamut indices, the color vector graphic, and fidelity and chroma shift indices for each hue bin
  • How quantities from TM-30-18 can be used to quantify and communicate color rendition, and be employed in the design of lighting systems, the spectral design of light sources, and the specification of lighting products
  • How to recognize the strengths and limitations of TM-30-18, and more generally recognize the limitations of all measures of color rendition

Who Should Attend:

  • Color and vision scientists
  • Lighting professionals, including lighting equipment manufacturers
  • Lighting researchers that study human perceptual and biological responses to optical radiation
  • Neuroscientists and chronobiologists that manipulate light spectrum
  • Interior designers and product designers interested in how light renders the colors of their work
  • Anyone interested in how light and objects interact to reveal color

About the Presenters:

Kevin Houser, Oregon State University

Kevin Houser is a Professor at Oregon State with a joint appointment at Pacific Northwest National Laboratory. He is also editor-in-chief of LEUKOS, the journal of the Illuminating Engineering Society (IES). He’s won the CIBSE Leon Gaster and Walsh Weston Awards, IES Taylor Technical Talent Award three times, the IES Presidential Award, and is a Fellow of IES. His recent work focuses on human perceptual and biological responses to optical radiation.


Michael Royer, Pacific Northwest National Laboratory

Mike Royer is a Senior Engineer at Pacific Northwest National Laboratory with a joint appointment at Oregon State. He is also an assistant editor for Lighting Research and Technology, co-chair of the IES Vision Science Committee, and a member of the IES Color Committee and CIE Technical Committee 1-91. His research focuses on improving lighting quality and reducing lighting energy use.