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Brightness In The Photopic Range: Psychophysical Modelling With Blue-sensitive Retinal Signals Light & Engineering Vol. 28, No. 5

Light & Engineering 28 (5)

Volume 28
Date of publication 10/16/2020
Pages 9-24

PDF

Brightness In The Photopic Range: Psychophysical Modelling With Blue-sensitive Retinal Signals Light & Engineering Vol. 28, No. 5
Articles authors:
Peter Bodrogi, Xue Guo, Tran Quoc Khanh

Peter Bodrogi, Dr. He is Optoelectronic Engineer at ERCO GmbH, Lüdenscheid, Germany. He studied physics at the Lorand Eotvos University in Budapest, Hungary. He obtained his Ph.D. degree in Information Technology from the University of Pannonia (Veszprém, Hungary). He obtained his Lecture Qualification Thesis (habilitation) in Lighting Engineering from the Technische Universität Darmstadt (Darmstadt, Germany). His interests concern lighting engineering, colorimetry, colour science, modern software technologies and LED lighting systems

Xue Guo, M. Sc., worked as a research fellow from May 2016 until June 2018 at the Laboratory of Lighting Technology of the Technische Universitaet Darmstadt, Germany. Currently (from July 2018 on) she works for the TÜV SÜD Product Service GmbH as a product specialist for luminaires and light measurement

Tran Quoc Khanh, Dr., Prof. He is studied from 1980 to 1985 Machine Engineering and Technical Optics before he finished his Ph.D. thesis on the Spectroscopy of UV‑VIS Radiation Sources in 1989. Between 1990–1997 and 1997–1999, he was laboratory leader and project manager for photometry, radiometry and colorimetry at PRC Krochmann and Gigahertz Optik. Between 2000 and 2006, he was technical manager for optical imaging systems at ARRI, developed a digital CMOS camera, a film scanner and a laser recorder and optimized colour image processing for cinematography and TV signal processing. In 2005, he completed his Lecture Qualified Thesis (habilitation) on colour appearance and visual performance and started his current work as a Professor for Lighting Technology and Solid‑State Lighting at the Technische Universität Darmstadt. He is conducting research and development projects on LED lighting technology. He is also the Chairman of the International Symposium for Automotive Lighting (ISAL). He is author of several books and scientific articles and inventor of patents on lighting technology and related subjects. He is currently Dean of the Department of Electrical Engineering and Information Technology at the Technische Universität Darmstadt

Abstract:
The brightness perception of a large (41°) uniform visual field was investigated in a visual psychophysical experiment. Subjects assessed the brightness of 20 light source spectra of different chromaticities at two luminance levels, Lv=267.6 cd/m2 and Lv=24.8 cd/m2. The resulting mean subjective brightness scale values were modelled by a combination of the signals of retinal mechanisms: S-cones, rods, intrinsically photosensitive retinal ganglion cells (ipRGCs) and the difference of the L-cone signal and the M-cone signal. A new quantity, “relative spectral blue content”, was also considered for modelling. This quantity was defined as “the spectral radiance of the light stimulus integrated with the range (380–520) nm, relative to luminance”. The “relative spectral blue content” model could describe the subjective brightness perception of the observers with reasonable accuracy.
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