Affiliations: [a] Institute for Leisure, Travel, and Alpine Medicine, University for Health Sciences, Medical Informatics, and Technology, Eduard Wallnoefer-Zentrum 1, Hall, Austria | [b] Central Institute for Medical and Chemical Laboratory Diagnostics, University Hospital Innsbruck-TILAK, Innsbruck, Austria | [c] Bartenbach LichtLabor, Aldrans, Austria
Correspondence:
[*]
Address for correspondence: PD Dr. Georg Hoffmann, Institute for Leisure, Travel, and Alpine Medicine, University for Health Sciences, Medical Informatics and Technology Tyrol, Eduard Wallnoefer-Zentrum 1, A-6060 Hall, Austria, Tel.: +43 59 8648 3856; Fax: +43 50 8648 673840; E-mail: georg.hoffmann@umit.at
Abstract: High-quality workplace illumination exerts a number of benefits with respect to the employees' productivity as well as the maintenance of a physiological circadian rhythm and well-being. In the present study, two different lighting environments were investigated, one representing a standard lighting design in a window-less office (500 lux, 4000 K), the other providing a variable setup (500–1800 lux, 6500 K). The variable lighting system resulted in the expected effects on parameters of circadian rhythm (e.g. a decreased serum melatonin concentration at the end of each day of the study). However, the test light with its variable intensities and higher color temperature did not turn out to be superior to the regular workplace illumination.
