Michael Royer

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Biography

Dr. Michael Royer joined PNNL in 2011, and primarily works on the Advanced Lighting Science and Technology Research program. His primary research area is human factors in lighting. He conducts experiments to help refine metrics and specification guidance, with the ultimate goals of advancing lighting quality to improve building occupants' satisfaction and increasing the use of energy efficient lighting technologies. He has been instrumental to the development of ANSI/IES TM-30-18, IES Method for Evaluating Light Source Color Rendition. He has authored over 60 journal articles and government reports covering many aspects of light and its application in architectural environments.

Michael is co-chair of the Illuminating Engineering Society (IES) Vision Science committee and a member of the Color Committee and Technical Procedures Committee (TPC). He also serves on the International Commission on Illumination (CIE)-U.S. National Executive Committee and other CIE technical committees. He is an associate editor for the journal Lighting Research & Technology.

Prior to joining PNNL, Michael earned a Ph.D. in Architectural Engineering from Penn State University, receiving the 2013 Taylor Technical Talent Award from the IES for his published work, which focused on tuning optical radiation for visual and nonvisual effects.

Research Interests

Human factors in lighting, including color perception the relationship between light and health
Spectral optimization
Long-term performance of lighting products
Developing metrics for both energy-related and quality-related aspects of lighting

Education and Credentials

B.A.E. / M.A.E., Architectural Engineering, Penn State University, 2008
Ph.D., Architectural Engineering, Penn State University, 2011

PNNL Publications

2023

Baxter D.J., D. Durmus, and M.P. Royer. 2023. "Enumeration reduction algorithm for the characterization of multi-primary LED systems." Lighting Research & Technology 55, no. 3:242 - 257. PNNL-SA-166973. doi:10.1177/14771535221111652
Royer M.P., M.J. Murdoch, K.A. Smet, L. Whitehead, A. David, K.W. Houser, and T. Esposito, et al. 2023. "Improved Method for Evaluating and Specifying the Chromaticity of Light Sources." LEUKOS - The Journal of the Illuminating Engineering Society of North America 19, no. 1:35-52. PNNL-SA-160997. doi:10.1080/15502724.2022.2029710

2022

Esposito T., M.P. Royer, and K.W. Houser. 2022. "Measures of illuminant-induced metameric mismatch: Theory, comparative analysis, and implications for application." Optics Express 30, no. 9:14686-14708. PNNL-SA-167794. doi:10.1364/OE.451626
Houser K.W., T. Esposito, M.P. Royer, and J. Christoffersen. 2022. "A Method and Tool to Determine the Colorimetric and Photobiological Properties of Light Transmitted Through Glass and Other Optical Materials." Building and Environment 215. PNNL-SA-166975. doi:10.1016/j.buildenv.2022.108957
Royer M.P., K.W. Houser, D. Durmus, T. Esposito, and M. Wei. 2022. "Recommended Methods for Conducting Human Factors Experiments on the Subjective Evaluation of Colour Rendition." Lighting Research & Technology 54, no. 3:199-236. PNNL-SA-158924. doi:10.1177/14771535211019864

2020

David A., T. Esposito, K.W. Houser, M.P. Royer, K.A. Smet, and L. Whitehead. 2020. "A Vector Field Color Rendition Model for Characterizing Color Shifts and Metameric Mismatch." LEUKOS - The Journal of the Illuminating Engineering Society of North America 16, no. 2:99-114. PNNL-SA-135593. doi:10.1080/15502724.2018.1554369
Royer M.P., M. Wei, A. Wilkerson, and S.F. Safranek. 2020. "Experimental validation of color rendition specification criteria based on ANSI/IES TM-30-18." Lighting Research & Technology 52, no. 3:323-349. PNNL-SA-142381. doi:10.1177/1477153519857625

2019

Huang H., M. Wei, and M.P. Royer. 2019. "Perceived colour fidelity under LEDs with similar Rf but different Ra." Lighting Research & Technology 51, no. 6:858-869. PNNL-SA-136172. doi:10.1177/1477153519825997
Royer M.P. 2019. "Comparing Measures of Gamut Area." LEUKOS - The Journal of the Illuminating Engineering Society of North America 15, no. 1:29-53. PNNL-SA-132222. doi:10.1080/15502724.2018.1500485
Royer M.P. 2019. "Evaluating tradeoffs between energy efficiency and color rendition." OSA Continuum 2, no. 8:2308-2327. PNNL-SA-141315. doi:10.1364/OSAC.2.002308

2018

Royer M.P. 2018. "Comparing Measures of Average Color Fidelity." LEUKOS - The Journal of the Illuminating Engineering Society of North America 14, no. 2:69-85. PNNL-SA-128752. doi:10.1080/15502724.2017.1389283
Royer M.P. 2018. "Opinion: Making the Most of Colour Rendition Research." Lighting Research & Technology 50, no. 3:338-339. PNNL-SA-131836. doi:10.1177/1477153518773573
Royer M.P. 2018. "TM-30 Guidance." LD+A Magazine 46, no. 6:24-28. PNNL-SA-134085.
Royer M.P., K.W. Houser, and A. David. 2018. "Chroma Shift and Gamut Shape: Going Beyond Average Color Fidelity and Gamut Area." LEUKOS - The Journal of the Illuminating Engineering Society of North America 14, no. 3:149-165. PNNL-SA-127109. doi:10.1080/15502724.2017.1372203

2017

Royer M.P. 2017. "What is the Reference? An Examination of Alternatives to the Reference Sources Used in IES TM-30-15." LEUKOS - The Journal of the Illuminating Engineering Society of North America 13, no. 2:71-89. PNNL-SA-119373. doi:10.1080/15502724.2016.1255146
Royer M.P., A. Wilkerson, M. Wei, K.W. Houser, and R.G. Davis. 2017. "Human perceptions of colour rendition vary with average fidelity, average gamut, and gamut shape." Lighting Research & Technology 49, no. 8:966-991. PNNL-SA-116963. doi:10.1177/1477153516663615
Royer M.P., and M. Wei. 2017. "The Role of Presented Objects in Deriving Color Preference Criteria from Psychophysical Studies." LEUKOS - The Journal of the Illuminating Engineering Society of North America 13, no. 3:143-157. PNNL-SA-121334. doi:10.1080/15502724.2016.1271339
Royer M.P., K.W. Houser, and A. David. 2017. "Chroma Shift and Gamut Shape: Going Beyond Average Color Fidelity and Gamut Area." In IES 2017 Annual Conference Proceedings, August 10-12, 2017, Portland, Oregon. New York, New York:Illuminating Engineering Society. PNNL-SA-127957.

2016

Davis L., J. Young, and M.P. Royer. 2016. CALiPER Report 20.5: Chromaticity Shift Modes of LED PAR38 Lamps Operated in Steady-State Conditions. PNNL-25201. Richland, WA: Pacific Northwest National Laboratory. CALiPER Report 20.5: Chromaticity Shift Modes of LED PAR38 Lamps Operated in Steady-State Conditions
Royer M.P. 2016. "IES TM-30-15 Is Approved - Now What?: Moving Forward with New Color Rendition Measures." LEUKOS - The Journal of the Illuminating Engineering Society of North America 12, no. 1-2:3-5. PNNL-SA-112850. doi:10.1080/15502724.2015.1092752
Royer M.P., and K.W. Houser. 2016. "Color Rendering: What do we want?." LD+A Magazine. PNNL-SA-121039.

2015

David A., P.T. Fini, K.W. Houser, Y. Ohno, M.P. Royer, K.A. Smet, and M. Wen, et al. 2015. "Development of the IES method for evaluating the color rendition of light sources." Optics Express 23, no. 12:15888-15906. PNNL-SA-111073. doi:10.1364/OE.23.015888
Houser K.W., M.P. Royer, and A. David. 2015. "Evaluating Light Source Color Rendition using the IES TM-30-15 Method." In 5th Professional Lighting Design Conference (PLDC 2015), October 28-31, 2015, Rome, Italy. G�tersloh:VIA-Verlag. PNNL-SA-111641.
Houser K.W., M.P. Royer, and L. Whitehead. 2015. "Correspondence: In support of the IES method of evaluating light source colour rendition." Lighting Research & Technology 47, no. 8:1029-1034. PNNL-SA-113267. doi:10.1177/1477153515617392
Royer M.P., M.B. Merzouk, N.J. Miller, and T.A. Beeson. 2015. CALiPER Report 23: Photometric Testing of White-Tunable LED Luminaires. PNNL-24595. Richland, WA: Pacific Northwest National Laboratory. CALiPER Report 23: Photometric Testing of White-Tunable LED Luminaires

2012

Royer M.P., and K.W. Houser. 2012. "Spatial Brightness Perception of Trichromatic Stimuli." LEUKOS - The Journal of the Illuminating Engineering Society of North America 9, no. 2:89-108. PNNL-SA-91455.