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Light & Engineering 26 (2)

Light & Engineering 26 (2)

Volume 26
Date of publication 07/01/2018
Pages 68-74

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Effective Radiant Flux for Non-image Forming Effects – is the Illuminance and the Melanopic Irradiance at the Eye Really the Right Measure . L&E 26 (2) 2018
Articles authors:
Kai Broszio, Martine Knoop, Mathias Niedling, Stephan Völker

Is a Ph.D. student in the field of non-image forming effects on humans at the Chair of Lighting Technology, TU Berlin. He studied Electrical Engineering with a specialization on lighting technology and photovoltaic and worked on the European project Energy Saving Outdoor Lighting (ESOLi). He is currently working as teaching and research assistant at the Chair of Lighting Technology. His doctoral thesis deals with the impact of directionality of light on non-image forming effects. He is a guest member of the indoor lighting expert group of the German Society of Lighting Technology (LiTG)

Is a lecturer at the Chair of Lighting Technology, Technische Universitöt Berlin (TUB), Germany. She is responsible for research and education on indoor lighting, daylighting and colorimetry. Before taking up her assignment at the TU Berlin, she was a senior application specialist of Philips Lighting, the Netherlands and part-time visiting professor at Eindhoven University of Technology. Her current research focuses on the unique characteristics of daylight. It aims to promote and improve daylight design, as well as to develop new adaptive electric lighting solutions, to enhance user well-being and performance in interiors

Is a Ph.D. student and former technical project manager, and teaching assistant at the Chair of Lighting Technology, TU Berlin. He studied Media Technology at Ilmenau University of Technology. From 2008 to 2010, he worked as a development engineer at OLIGO surface controls. His current work focuses on non-image forming effects, glare, and outdoor lighting. His doctoral research examines the influence of glare sources spectra on discomfort and disability glare. Mathias is member of the German Institute for Standardization (DIN) and the outdoor lighting expert group of the German Society of Lighting Technology (LiTG)

Prof., studied Electrical Engineering at the Technical University Ilmenau, Germany. Afterwards, he worked there as a researcher for new high temperature plasma applications. Prof. Voelker accomplished his graduation at the Department of Lighting Technology in Ilmenau in 1999. Thereafter, he was senior engineer and senior researcher at the Hella KG. In 2002, he started working as a junior research professor for Lighting Technology in Paderborn, Germany, where he led an own research group. Additionally, he worked as a guest lecturer at the University College of London. Since 2008, Prof. Völker is full Professor and Head of the Department of Lighting Technology at the Technische Universitöt Berlin, Germany. His main research interests are: adaptive road lighting based on visibility, adaptive indoor lighting for design, glare evaluation of LED-luminaires and day lighting. He is the chair of CIE TC4Р33 and member of CIE TC4Р54 & 4Р52, board member of the LiTG, member of the advisory board of FNL & DIN and member of the TWA

Abstract
Research indicates that intrinsically photosensitive Retinal Ganglion Cells are not evenly distributed or evenly sensitive throughout the retina. Still, most research looking into non-image forming (NIF) effects uses an integral measured quantity, illuminance or melanopic weighted irradiance, to represent the amount of light at the participantsХ eye level. This paper describes a theoretical approach to define the effective radiant flux for stimulating the ipRGCs, taking into account a spatially resolved sensitivity. Research on retinal sensitivity is scares and not yet substantial, but the methodology can easily be adopted when areas of specific sensitivity are set. Preliminary results indicate that, with similar vertical illuminances and spectral power distribution, typical office lighting solutions might have a lower NIF effectiveness than settings with higher luminances in the central part of the field of view. This could explain why research on NIF effects is inconclusive, even though reported lighting conditions are similar.
References
1. LiTG (2015), Тöber die nicht-visuelle Wirkung des Lichts auf den Menschen,У Deutsche Lichttechnische Gesellschaft e.V., Berlin, vol. 1, 2015.
2. C. Schierz, ТZur Photometrie nichtvisueller Lichtwirkungen,У in Proc. 2008 Symposium ТLicht und GesundheitУ, pp. 112Р123.
3. P. Teikari, ТSpectral modulation of melanopsin responses: role of melanopsin bistability in pupillary light reflex,У Ph.D. dissertation, Universitö Claude Bernard- Lyon I, 2012.
4. P. Novotny, P. Paulick, M.J. Schwarz, H. Plischke, ТThe Solid Angle of Light Sources and Its Impact on the Suppression of Melatonin in Humans,У in Proc. 2013 Human- Computer Interaction. Towards Intelligent and Implicit Interaction Conf., Lecture Notes in Computer Science, vol 8008. Kurosu, Ed. Berlin, Heidelberg: Springer, 2013, pp. 454Р463.
5. J. Y. Wang, J.P. Hanifin, M.D. Rollag and G.C. Brainard, ТOcular regulation of the human pineal gland: The significance of total retinal exposure for melatonin suppression,У in: M.F. Holick und E.G. Jung, Ed. Boston, MA: 1998, Biologic Effects of Light 1998: Proceedings of a Symposium Basel, Switzerland November, 1998. Springer US, pp. 367Р374.
6. G. C. Brainard, M.D. Rollag and J.P. Hanifin, ТPhotic regulation of melatonin in humans. Ocular and neural signal transduction,У Journal of Biological Rhythms, 1997, Vol. 12, pp. 537Р546.
7. E. K. Visser, D. G.M. Beersma, and S. Daan, ТMelatonin Suppression by Light in Humans Is Maximal When the Nasal Part of the Retina Is IlluminatedУ Journal of Biological Rhythms, vol. 14, pp. 116Р121.
8. M. Röger, M. C.M. Gordijn, D. G.M. Beersma, B. de Vries and S. Daan, ТNasal versus Temporal Illumination of the Human Retina: Effects on Core Body Temperature, Melatonin, and Circadian Phase,У Journal of Biological Rhythms, 2005, Vol. 20, pp. 60Р70.
9. T. A. Lasko, D.F. Kripke and J.A. Elliot, ТMelatonin Suppression by Illumination of Upper and Lower Visual Fields,У Journal of Biological Rhythms, vol. 14, pp. 122Р125, 1999.
10. J. S. Smith, D.F. Kripke, J.A. Elliot and S.D. Youngstedt, ТIllumination of upper and middle visual fields produces equivalent suppression of melatonin in older volunteers,У Chronobiology International, 2002, Vol. 19, pp. 883Р891.
11. G. Glickman, J.P. Hanifin, M.D. Rollag, J. Wang, H. Cooper, G.C. Brainard, ТInferior Retinal Light Exposure Is More Effective than Superior Retinal Exposure in Suppressing Melatonin in Humans,У Journal of Biological Rhythms, 2003, Vol. 18, pp. 71Р79.
12. H. Piazena, L. Franke, B. Thomsen, I. Kamenzky, R. Uebelhack and S. Völker, ТMelatoninsuppression mit Weiölicht-LEDs Р erste Ergebnisse,У in Proc. 2014 8. Symposium Licht und Gesundheit, pp. 39Р52.
13. C. Schierz, ТIst die Beleuchtungsstörke am Auge die richtige Grööe för biologische LichtwirkungenöУ in Proc. 2010 DIN-Expertenforum ТWirkung des Lichts auf den MenschenУ pp. 7Р17.
14. J. Van Derlofske, A. Bierman, M. S., Rea and N. Maliyagoda, ТDesign and optimization of a retinal exposure detectorУ, in Proc. 2000 International Society for Optics and Photonics Р International Symposium on Optical Science and Technology, pp. 60Р70.
15. J. Van Derlofske, A. Bierman, M. S., Rea, J. Ramanath and J.D. Bullough, ТDesign and optimization of a retinal flux density meter,У Measurement Science and Technology, 13(6), 821, 2002.
16. FGL (Fördergemeinschaft Gutes Licht) (2014), Тlicht.wissen 19 Impact of Light on Human Beings,У [Online]. Available: http://en.licht.de/fileadmin/shop-downloads/ 1409_LW19_E_Impact-of-Light-on-Human-Beings_ web.pdf.
17. M. Röger, M. C.M. Gordijn, D. G.M. Beersma, B. de Vries and S. Daan, ТWeak relationships between suppression of melatonin and suppression of sleepiness/ fatigue in response to light exposure,У Journal of Sleep Research, 2005, Vol. 14, pp. 221Р227.
18. R. J. Lucas, S.N. Peirson, D.M. Berson, T.M. Brown, H.M. Cooper, C.A. Czeisler et al., ТMeasuring and using light in the melanopsin age,У Trends in neurosciences, 2014, Vol. 37, pp. 1Р9.
19. C. Liedtke, S. Völker and M. Knoop, ТThe Light Direction and Directional Light Р Towards a new Quantification of an Essential Lighting Quality Criterion,У in Proc. 2013 CIE Centenary Conf., pp.542Р551.
20. M. Knoop, A. Diakite, C. Liedtke, K. Broszio, M. Niedling, ТCharacterisation of daylightХs spatial and spectral distribution to assess its impact on human beings, Т unpublished, presented at CIE Midterm
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