Can we add a bit of sunshine to indoor light?

After a good start in Groningen, we decided to expand the study of the effects of near-infrared light in humans to Amsterdam. This is the very first long-term research into the effects of pulsed near-infrared (NIR) light on human well-being and health. The research is sponsored by Seaborough and is in collaboration with the Chronobiology Department of the University of Groningen. The protocol is a clinical trial (NCT NL8800) in which we will investigate the effects of long-term exposure to near-infrared (NIR) on humans in the winter months. This part of the light spectrum occurs in sunlight, but is absent from indoor artificial light. We are currently looking for 40 healthy participants who are sleep deprived and are willing to test the effect of these “sunlight-like” exposures of NIR for 4 weeks. Output parameters include mood, well-being, mental performance, sleep quality and the immune system. You will receive a Fitbit to measure the effects. Afterwards, and after submitting all data, you can keep the Fitbit or you will receive a compensation of (or supplement up to) 600 euros. If you live near Groningen or Amsterdam and are interested in participating, please send an email to The data collection will run through June 2021, so be quick! You will receive more information on request, a consent form and a link to selection questionnaires. A short summary of the project can be found here (in Dutch) PBM info voor deelnemers – apr-jun