About the Authors

Raymond P. Najjar

Current address: Psychiatry and Behavioral Sciences, Stanford University – Veterans Affairs Palo Alto Health Care System, Palo Alto, California, United States of America

Affiliations Inserm U846, Stem Cell and Brain Research Institute, Bron, France, University of Lyon, Claude Bernard Lyon 1, Villeurbanne, France

Luzian Wolf

Affiliation Wolf Technologieberatung - Object-Tracker, Perchtoldsdorf, Austria

Jacques Taillard

Affiliations University of Bordeaux, Sommeil, Attention et Neuropsychiatrie, USR 3413, Bordeaux, France, CNRS, Sommeil, Attention et Neuropsychiatrie, USR 3413, Bordeaux, France

Luc J. M. Schlangen

Affiliation Philips Research, High Tech Campus 34 5656AE, Eindhoven, The Netherlands

Alex Salam

Affiliation Institut Polaire Français Paul-Emile Victor (IPEV), Technopôle Brest-Iroise - BP 75, Plouzané, France

Christian Cajochen

Contributed equally to this work with: Christian Cajochen, Claude Gronfier

christian.cajochen@upkbs.ch (CC); claude.gronfier@inserm.fr (CG)

Affiliation Centre for Chronobiology Psychiatric University Clinic, University of Basel, Basel, Switzerland

Claude Gronfier

Contributed equally to this work with: Christian Cajochen, Claude Gronfier

christian.cajochen@upkbs.ch (CC); claude.gronfier@inserm.fr (CG)

Affiliations Inserm U846, Stem Cell and Brain Research Institute, Bron, France, University of Lyon, Claude Bernard Lyon 1, Villeurbanne, France

Competing Interests

Co-author Luc Schlangen is employed by Philips Lighting, Eindhoven. The experimental light (Philips, ActiViva Active, TLD 36 W, with a correlated color temperature of 17000 K) was used in this study. The Neurobehavioral Test Battery, the LightWatcher hardware, study coordination, and data processing related to the LightWatcher hardware was funded with company funds of Wolf Technologieberatung - Object-Tracker. There are no further patents, products in development or marketed products to declare. This does not alter the authors' adherence to all the PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: CG CC JT. Performed the experiments: AS. Analyzed the data: RN LW JT AS CC CG. Contributed reagents/materials/analysis tools: LW LJMS. Wrote the paper: RN JT CC CG.