IES Virtual Research Symposium

2020 IES Research SymposiumWe hope that you find this virtual symposium insightful, beneficial, and of the quality that you have come to expect from the IES.

This event is held through the IES webcasting platform and will take place over four different days in order to allow participants to attend with limited disruption during work hours. Participants viewing this entire program are eligible to receive up to 8 IES Continuing Education Units (CEUs).

DAY 1: Tuesday, May 12, 2020
DAY 2: Friday, May 15, 2020
DAY 3: Tuesday, May 19, 2020
DAY 4: Friday, May 22, 2020

TIME: Each day will be 12:00 pm ET – 2:00 pm ET


CEUs: Maximum of 8 IES CEUs for complete participation


Małgorzata Perz and Gilles Vissenberg


We will (briefly) review the current glare measures, revealing some of their shortcomings. Then, I’ll present the recent developments on the integrated discomfort glare measure based on the human visual system.

Małgorzata Perz
Malgorzata PerzMałgorzata Perz was born in Poland in 1984. She goes by Gosia. She completed her secondary education at the Sports Championship High School in Szklarska Poręba, where she practiced biathlon. She studied Information and Communication Management at Neisse University and received her BS diploma in 2006. She continued her education at Wrocław University of Technology and in 2007 she earned Inzynier (Ir) degree in Computer Science and Management. Meanwhile, from 2006 to the end of 2007 she worked at Capgemini (PL), holding position of an Incident, Problem & Change Manager. In 2008, she moved to The Netherlands where she enrolled at Eindhoven University of Technology and followed Human-Technology Interaction program. In 2010 she received her MSc degree, following her diploma internship at Philips Research Europe. After graduation she worked at Philips Research and since 2016 she works at Signify Research, holding position of Scientist Optics Light & Vision. In her work she mainly focuses on studying different aspects of quality of light, including temporal, e.g. flicker, and the stroboscopic effect, spatial, e.g. glare and sparkle, and spectral, e.g. whiteness. From 2014 to 2019 she conducted research at TU/e Intelligent Lighting Institute, resulting in a thesis entitled Modelling Visibility of Temporal Light Artefacts for which she was awarded her PhD cum laude.

Gilles Vissenberg
Gilles VissenbergGilles Vissenberg (born 1972, St. Maarten, Dutch West Indies) is principal scientist lighting applications at Signify Research, Eindhoven, The Netherlands. His current and previous work interests are optical design of LED lamps and luminaires, lighting application research, office lighting, energy saving and quality of light. He worked on LED spot lights and general illumination LED lighting systems, with a focus on low-glare solutions. He Dutch voting member of CIE division 3 (interior environment and lighting design) and was involved in the recent correction to the unified glare rating (CIE 232: 2019). He holds a Ph.D. from Leiden University, the Netherlands, and a Master degree in Theoretical Physics from the University of Nijmegen, the Netherlands. He published over 30 scientific papers and filed over 170 independent patent applications (88 patents are granted in the USA), mainly on illumination optics and LED lighting applications.

Arnold Wilkins

Lighting versus comfort

The human visual system evolved to process images from nature efficiently. These images have little rapid modulation in light level. The lighting chromaticity is close to the Planckian l focus. The Fourier amplitude is proportional to wavelength, i.e. to the reciprocal of spatial frequency. The color contrast is modest. I will consider how electric lighting is un-natural in all four respects and how it causes discomfort and cortical hyper-metabolism as a direct result. There are large individual differences in the perception of the rapid modulation of light but Individuals who experience visual stress can see temporal light artifact from flicker at frequencies up to 11kHz. Although healthy individuals find lighting comfortable when it has a chromaticity close to the Planckian locus, those who experience migraine with aura choose as comfortable strongly saturated colors of lighting, mostly well away from the Planckian locus. The spatial arrangement of ceiling luminaires is often such as to create an uncomfortable repetitive pattern of bright light sources. The properties of uncomfortable patterns are well described, and it is possible to use computer algorithms to avoid such uncomfortable arrangements.

Arnold WilkinsArnold Wilkins is a Fellow of the British Psychological Society and an Honorary Fellow of the College of Optometrists. His postdoctoral study was undertaken at the Montreal Neurological Institute where he became interested in photosensitive epilepsy. He then spent 22 years at the Medical Research Council Applied Psychology Unit in Cambridge studying light sensitivity as it occurs not only in epilepsy, but migraine and dyslexia.  In 1997 he moved to a chair at the University of Essex, where he is now Emeritus. He has published extensively on visual stress and authored three books.

Jim Uttley

Making lighting research more credible

A range of scientific disciplines are currently undergoing a 'reproducibility crisis', which questions the credibility of much previous research. This talk will highlight some of the issues raised by the reproducibility crisis and their relevance to lighting research, and discuss opportunities for improving our research practices to ensure we gather and report meaningful and credible data.

Jim UttleyJim Uttley has a background in Psychology and Behavioural Science. His research applies principles of behavioural research and environmental psychology to the built environment. One of his main interests is the influence of the built environment, particularly lighting, on active travel.


Naomi Miller

Human Biological Inputs

Gauging environments for biological effects: How do we measure and report light exposure? The lighting research and practice communities are still wrestling with how to evaluate spaces for biological effect. What tools should we use to measure and communicate the light spectrum, duration, and dose? How are those translated into a daily light exposure, and what metrics are appropriate? This talk will introduce the melanopic EDI and melanopic DER metrics proposed by the CIE.

Naomi MillerNaomi Miller straddles the line between design and engineering at the Pacific Northwest National Laboratory in Portland OR. By bridging the gap between technology and application, she promotes the wise use of LEDs, working with industry to overcome hurdles and celebrate the opportunities. She is currently serves on the Illuminating Engineering Society’s Board of Directors, and is both a Fellow of the IES and the IALD.

Dr. George C. Brainard

Light Regulation of Human Circadian, Neuroendocrine and Neurobehavioral Response

Signals transmitted from the intrinsically photosensitive retinal ganglion cells (ipRGCs) reach numerous nuclei and regions in the brain, ultimately having an impact on the peripheral physiology of the body. Accurate measurement of biological and behavioral characteristics such as circadian phase, sleep duration, melatonin secretion, alertness, and numerous other physiological responses is important to understanding how light ultimately impacts human health. This talk will introduce strengths and limitations of some of these biological and behavioral measures in laboratory and field studies.

George C. BrainardDr. George Brainard has directed Jefferson's Light Research Program since 1984. This program's research studies the effects of light on neuroendocrine physiology and circadian regulation in humans. Using the techniques of photobiology, radioimmunoassay, and performance testing, this group has documented how various visible and nonvisible light sources influence both hormonal balance and behavior. Current studies include elucidating the action spectrum of melatonin regulation, investigating the phase shifting capacities of light, studying the influence of light on tumor progression, and testing new light treatment devices for winter depression.

Doug Steel

What does Light Quality mean to a Neuroscientist?

Neuroscience and Engineering share a common problem when it comes to characterizing Light Quality; while mathematics allows quantification of tangible properties, the field quickly becomes "squishy" and intangible because of hidden, unknown, or emergent properties. Thus we are left saying "I don't know how to measure it, but I know it when I see it." In this talk we will explore how Systems Neuroscience is bringing understanding to the properties of light that shape our experiences in health and disease.

Douglas SteelDouglas Steel, PhD is the Founder of NeuroSense ( A Translational Scientist, for the past several years he has been working on the development of applications of spectrally-tunable LED arrays as an alternative to prescription drugs for the treatment of neurological and psychiatric conditions.

He is also a serial entrepreneur, having founded or co-founded and managed 6 technology start-up companies over the past 17 years in a number of life science areas. For several years he was an Entrepreneur-in-Residence at the University of Utah.

Doug has over 30 years of experience in pharmaceutical drug design and discovery, and research project management and implementation divided between academia and the pharmaceutical industry. He has received training in medical sciences and neuroscience, basic and applied biotechnology, integrative neuroscience, and brain-environment interactions. He is the author of over 20 publications in scientific journals and books in the areas of drug design, drug discovery, and marine biochemistry. He has also written over 30 technology articles in the popular press.

Doug holds an M.Phil. and PhD in Biomedical Sciences from Columbia University, an MS (Psychobiology, Univ. of Florida), and a BA (Biology/Chemistry, Kalamazoo College). He also held pharmaceutical research positions at The Upjohn Company, CIBA-Geigy, and Syntex Pharmaceuticals.

Doug is a member of the Science Advisory Panel of the IES (Illuminating Engineering Society), and also serves on the Science Advisory Boards of the Midwest Lighting Institute and the LESA Center at RPI (Lighting Enabled Systems and Applications).

Connie Samla

Evaluating Sleep and Behavior in Seniors and Children

Over the past five years SMUD has worked on several lighting projects focusing on sleep and behaviors but utilizing different methods of evaluation. Each successful project had commonalities such as administrative and technical champions, participant education as well as staff dedication. Focusing on sleep for seniors demonstrated positive outcomes with fewer nighttime sleep disturbances while children with autism had noticeable improvements in sleep, behaviors and transitions.

Connie SamlaConnie Samla is SMUD’s Lighting Specialist who is a resource in lighting design for commercial, residential, and industrial customers with over twenty-five years of experience. At SMUD, Connie teaches and coordinates workshops, works on R&D projects and has taught lighting design classes at California State University Sacramento. Connie has a Bachelor of Science in Architectural Engineering from the University of Kansas, a Bachelor of Arts in Ministerial Studies, is a registered electrical engineer, past president of the local IES section, and is lighting certified.


Bill Browning

The economics of biophilia

Bill will discuss physiological and economic implications of improved indoor lighting. He will also introduce a recent study exploring the effect of biophilic design interventions on student stress and academic success, and will explain how the study's structure can inform future lighting research. Lastly, Bill will show a few case studies illustrating how designers are using scientific insights to improve the indoor experience.

Bill BrowningBill Browning is one of the green building and real estate industry’s foremost thinkers and strategists, and an advocate for sustainable design solutions at all levels of business, government, and civil society. His expertise has been sought out by organizations as diverse as Fortune 500 companies, leading universities, non-profit organizations, the US military, and foreign governments. He is passionate about the interactions between the built and natural environment, and how that supports health and wellbeing. In 2006, Mr. Browning founded a new firm, Terrapin Bright Green, to craft high-performance environmental strategies for corporations, governments, and large-scale real estate developments.

Ron Gibbons

Measuring Impact

This talk will highlight methods and approaches to measuring the impact of lighting in the exterior environment. How light impacts drivers and pedestrians, and some of the new approaches to consider in lighting design with the advent of solid state lighting, will be discussed.

Ron GibbonsRon Gibbons is the Director of the Center for Infrastructure Based Safety Systems (CIBSS) at the Virginia Tech Transportation Institute (VTTI). He is the Institute’s lead lighting research scientist. He is currently the PI on projects investigating the impact of outdoor lighting on human health, the Spectral Effects of new light sources on roadways, the visibility of police vehicles and is the subject matter lead for the FHWA office Safety IDIQ contract. Dr. Gibbons is also an Associate Professor in the School of Architecture and Design at Virginia Tech. Gibbons is the author of over 80 published papers on roadway lighting, photometry, and target visibility. He is a past Director of Division 4 of the International Commission on Illumination (CIE) and a past president of the Illuminating Engineering Society of North America.

Tony Esposito

Specifying light source color rendition

This session will describe the current state of lighting metrics for the specification of light source color rendition with particular focus on the description, computation, application, and translation of IES TM-30 metrics and TM-30 ANNEX E color rendition specification categories. The session will close with a look into the future of color science research, with specific emphasis on metrics and aspects of color rendition not covered within the IES TM-30 framework.

Tony EspositoTony Esposito holds a doctorate in Architectural Engineering from Penn State University with a minor in statistics. His specialties include color science, color discrimination, human factors research methods, and spectral modeling and optimization. His primary research goal is to develop an accurate and intuitive color discrimination metric for applied lighting.

Tony is a former graduate education fellow to the National Science Foundation, has won the Robert J. Besal Scholarship four times, and is a recipient of the 2019 Richard Kelly Grant. He currently serves as a voting member of the IES Color Committee and is the Founder and Head Research Scientist of Lighting Research Solutions LLC.

Clarence Waters and Michael Kuhlenengel

Evidence-Based Interactions between Indoor Environmental Factors and Their Effects

We will speak about a recently completed project entitled “Evidence-Based Interactions between Indoor Environmental Factors and Their Effects on K-12 Student Achievement”. The study, funded by the Environmental Protection Agency (EPA), measured lighting (both daylight and electric), acoustical, thermal, and indoor air quality characteristics of 220 classrooms in five school districts and compared them to student performance on standardized tests.

Dr. Clarence WatersDr. Clarence Waters is the Aaron Douglas Professor of Architectural Enigneering (AE) in the Durham School of Architectural Engineering and Construction at the Universtoiy of Nebraska-Lincoln. Dr. Waters has a Ph.D. in AE from Pennsylvania State University (1993). His B. S. (1978) and M.S. degrees (1988) are in AE from Kansas State University. Dr. Waters has been on the faculty of the University of Nebraska-Lincoln since 2000. Dr. Waters served on the faculty of Kansas State University in AE from 1986 to 2000. He was the head of the Department of Architectural Engineering and Construction Science at KSU for four years. He served as a Research Associate at the National Renewable Energy Laboratory (NREL) Golden, Colorado, (2011 - 2012). Prior to his academic career, Dr. Waters served for over seven years as an electrical project engineer for Professional Engineering Consultants in Wichita, Kansas.

Michael KuhlenengelMichael Kuhlenengel is a fourth year PhD student at the University of Nebraska - Lincoln in Architectural Engineering. He has spent the last five years working on a EPA funded research grant titled School Environmental Effects on Student Achievement. The EPA project studies the lighting, mechanical, and acoustics of classrooms on student achievement. His primary focus for the EPA project has been on lighting and statistical analysis. Michael has presented parts of this research at the 2016 IES conference, 2017 AEI conference, and the 2019 CISBAT conference. He is currently working to finish his PhD and journal articles for the EPA project.


Hugo Blasdel: Progress in Multi-measure MDS for Lighting Research, Design, and Education

Benjamin Feagin: Apparatus for Studying Human Perception of Luminance Uniformity

Kevin Leadford: Lighting Metrics for Interiors

Xiaojie Lu: Exploring a path-based lighting intervention on older adults’ movement behaviors in a patterned carpet of a senior living community

Lisa Lyon: Isolating Light Transfer Paths among Surfaces to Identify the Effect on Skin Tone Evaluation in a NICU Environment

Meg Smith: Challenging Conventional Wisdom: New Efforts to Create People-centric Approaches in Codes and Standards

Mashaaraa Bhatia: Colour: The Immeasurable Aspect Of Reflected White Light

Thomas Patterson: Recommended Lighting Design Strategies For Healthier Office Environments