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Light-Dosimeter

A device that measures and records light exposure

Due to social and economic changes and technological progress, humans no longer follow the natural light/dark cycle, but live in a 24-hour society. Daytime is spent in indoor settings, where light levels are a fraction of those outdoors. The darkness of nighttime is impacted by the use of artificial light. Whereas the connection between light exposure and human circadian entrainment is well established, the research community was missing two items for a long time: An agreement on what metrics to use and a device to take these measurements. The first gap was closed with the publication of CIE S 026:2018, the second gap is now closed with the light-dosimeter.

PRODUCT

The light-dosimeter is a mobile device, which records a person’s individual light exposure over time, i.e. its amount and spectral composition. The measurements are taken at eye level, as the device is worn attached to glasses. The «lido studio», a custom-made software, then converts the measurements into the metrics recommended by the CIE S 026:2018. The output is a pdf report with tables and graphs or a csv report. The light-dosimeters were tested by the Swiss Federal Institute of Metrology (METAS).

 

The key specifications are the following:

  • Spectral range: VIS 380 nm-780 nm
  • Intensity range: from 5 lx – 100k+ lx
  • Measurement interval: 10 sec
  • Battery life: 7 days
  • Interface: Micro-USB
  • Metrics used according to CIE S 026:2018

PROJECT

After the Velux Stiftung approved the funding for the project «Light exposure and health – light-dosimeter for the longterm recording and examination of biologically effective radiation and its effect on humans» (Project No. 1134), an interdisciplinary team from the Lucerne School of Engineering and Architecture, combining knowledge in light and lighting, electronics, product design, information technology and project management, started with the development of the light-dosimeter in early 2018. In addition, the project was  supported by three external partners:

 

People who contributed to the project from the Lucerne School of Engineering and Architecture:

  • Prof. Björn Schrader, Institute of Building Technology and Energy (IGE)
  • Prof. Othmar Schälli, Institute of Electrical Engineering (IET)
  • Dr. Giselher WichmannInstitute of Electrical Engineering (IET)
  • Prof. Erich StygerInstitute of Electrical Engineering (IET)
  • Christian Di BattistaInstitute of Electrical Engineering (IET)
  • Janine Stampfli, Institute of Building Technology and Energy (IGE)
  • Reto Häfliger, Institute of Building Technology and Energy (IGE)
  • Christoph ZumbühlInstitute of Electrical Engineering (IET)
  • Martin FriedliInstitute of Electrical Engineering (IET)
  • Said Ahsaine, Institute of Building Technology and Energy (IGE)
  • Stefan Ineichen, Institute of Building Technology and Energy (IGE)
  • Diego Rohner, Institute of Innovation and Technology Management (IIT)
  • Silvio EmmeneggerInstitute of Electrical Engineering (IET)
  • Christian JostInstitute of Electrical Engineering (IET)
  • Stefan Lustenberger, Mechanical Engineering and Energy Technology (IME)
  • David Huwyler, Institute of Electrical Engineering (IET)
  • Erny Niederberger, Institute of Electrical Engineering (IET)
  • Justin Rüssli-Kueh, Institute of Electrical Engineering (IET)

 

NEWS

Presentations:

  • Swiss Lighting Forum, Basel, Switzerland: «Human Centric Lighting – Hohe Erwartungen wecken reicht nicht aus» (30.1.2020)
  • BioWi, Weimar, Germany: «Licht-Dosimeter – Aufzeichnung einer ‘Light History’ von Probanden» (12.11.2019)
  • EUROSHNET, Dresden, Germany: «Light dosimeter – recording an individual’s light history» (12.6.2019)
  • LICHT2018, Davos, Switzerland: «Light-Dosimeter 2.0 for Research» (11.9.2018)
  • Light & Building, Frankfurt, Germany: «HCL-Light-Dosimeter 2.0 – Zur Erfassung der zeitlichen Strahlenexposition von Probanden» (22.3.2018)

Articles:

  • WirPlus (4/2021): «Lichtblicke für moderne ‘Höhlenmenschen’ – Es werde Licht im Homeoffice» (S. 18-21)
  • Bulletin (11/2019): «Die LED ist angekommen – Neue Themen in der Lichtforschung» (S. 10-17)
  • LICHT (4/2019): «Auf- und Umbruchstimmung in der Lichtforschung» (S. 80-81)
  • ET Licht (2/2019): «Mit Lichtgeschwindigkeit in die Zukunft» (S. 8)

CONTACT

Lucerne University of Applied Sciences
Engineering and Architecture
Technikumstrasse 21
6048 Horw
Switzerland

Contact person:

Janine Stampfli
e-mail: janine.stampfli@hslu.ch
phone: +41 (0)41 349 35 75