Daylight Metrics Update: New Provisions in LM-83-23 Spatial Daylight Autonomy (sDA) and Annual Sunlight Exposure (ASE)

Recorded On: 04/18/2024

About this Course

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

Description: IES Lighting Measurements (LM) 83-23, Approved Method: IES Spatial Daylight Autonomy (sDA) and Annual Sunlight Exposure (ASE) recently underwent significant revisions and ANSI certification. LM-83-23 describes the IES approved method for computing annualized climate-based metrics for daylight sufficiency (sDA) and for excessive sunlight exposure in buildings (ASE). It provides a common reference standard for daylighting performance across building typologies and climate regions. Learn from Daylighting Metrics Committee members about important changes made in the 2023 version and their rationale, along with their implications for daylighting design and analysis.  Perspectives and discussion regarding the application of LM-83-23 and an outlook toward the adoption of updated methods in software tools are included.  


Daylight Metrics Update: New Provisions in LM-83-23 Spatial Daylight Autonomy (sDA) and Annual Sunlight Exposure (ASE)
Open to view video.  |  60 minutes
Open to view video.  |  60 minutes This video is required for course completion.
1.00 CEU credit  |  Certificate available
1.00 CEU credit  |  Certificate available

Christopher Meek

Professor of Architecture

University of Washington

Christopher Meek, FAIA, IES is Professor of Architecture at the University of Washington and Director of the Center for Integrated Design at the University’s College of Built Environments. Professor Meek’s areas of research include building energy performance for new construction and retrofits, daylighting, visual comfort, electric lighting, and climate responsive design. His work bridges practice, research, and education with collaboration between practitioners, faculty, and students. Professor Meek teaches graduate and undergraduate level courses on building design and technology at the UW Department of Architecture and currently serves as Chair of the IES Daylighting Metrics Committee. 

Lisa Heschong

Architect, author

Lisa Heschong is a Fellow of the Illuminating Engineering Society. She was a licensed architect for 30 years and a principal of the Heschong Mahone Group (HMG). At HMG she led the field studies that provided the foundational research for the development of spatial Daylight Autonomy (sDA), and IES/ANSI LM-83.  

Heschong has a Masters of Architecture from MIT, where she was awarded the AIA School Medal. She has received three life-time achievement awards, including most recently the 2023 IES Medal.  

Heschong is the author of Thermal Delight in Architecture, (MIT Press 1979) and Visual Delight in Architecture: Daylight, Vision and View (Routledge, 2021) 

Richard Mistrick

Associate Professor

Penn State University

Richard Mistrick is an Associate Professor of Architectural Engineering at Penn State University, where he teaches and conducts research on lighting and daylighting design, metrics, and systems modeling.  He is active on numerous technical committees of the Illuminating Engineering Society of North America (IES), including the Nomenclature, Daylighting, and Daylight Metrics Committees, and is Chair of the Conference Papers Subcommittee.  He has authored dozens of technical and journal papers, was one of the four editors of the 2011 edition of the IES Lighting Handbook, and chaired the task group that recently revised LM-83. 

Collin Robinson

Collin Robinson is a design practitioner committed to beautiful buildings, delightful performance, and excellent stewardship of the environment. His 20-year architecture career ranges from aviation to higher-education to residential projects. He received a BArch professional degree from the University of Oregon. Spurred by the sublime power of daylight in buildings, he is particularly interested in applying simulation techniques to the art of daylight design. He serves on the IES Daylight Metrics Committee, who authored LM-83-23. He continues to pursue sustainable building strategies through his work at The Sheward Partnership, located in Philadelphia, PA.