Research in Circadian Lighting and user evidence

Chromaviso Circadian Lighting concepts and skills are documented in several research projects. At the same time, we work systematically with user research and practice evidence. It enables us to continually provide competent advice about the optimal, evidence-based solution.

Get an overview of the projects here:

Clinical Trials

Rigshospitalet – patients

The unit of clinical apoplexy at Rigshospitalet Glostrup have conducted research in Chromaviso Circadian Lighting since 2013. More than 90 patients hospitalised for rehabilitation for more than two weeks have been included. The research project looks at factors such as fatigue, sleep, depression, circadian markers, cognitive performance etc. The results will be published in 2017 and 2018 by Ph.D., Doctor Anders West in cooperation with a multidisciplinary expert group.

The following results have been published:

  • Reduced Depression Read more here. 
  • Reduced Fatigue
  • Improved Circadian markers (melatonin and cortisol)

Read more about the background of the project.

See film about the results and research 


Aarhus University Hospital – patients
Neuro-intensive care unit at Aarhus University Hospital have documented the effects of Circadian Lighting since 2013 – as part of a holistic treatment with both light, sound, information screens and observation. The effect is being documented on factors such as sleep, agitation, memory, time at hospital – the results are expected in 2018.

Chief Physician Helle Iversen says that the staff claims to be less tired on shifts and have more energy.


Rigshospitalet and Aarhus University Hospital – staff

The two units at both Rigshospitalet and Aarhus University Hospital have cooperated on a study documenting the effects of Chromaviso Circadian Lighting on the staffers – working both day and night. The study was released at The Danish Neuro Conference in May 2018. It showed that Chromaviso Circadian Ligting have a positive effect on sleep, energy and work environment are being documented.


Rigshospitalet, Psychiatric Centre Copenhagen, DTU Photonics and Copenhagen Trial Unit

The project called ROOM-LIGHT is led by Clinical Associate Research Professor and Psychiatrist, Klaus Martiny, Rigshospitalet and is an interdisciplinary collaboration between clinicians, researchers and lighting experts. The purpose is to develop and document a therapeutic light for patients who are hospitalized for depression. The project will result in guidelines for lighting in psychiatry in the future, and it is expected to be completed in 2019.

The project considers:

  • Depression
  • Sleep
  • Duration of inpatient stay
  • The use of medicine
  • Circadian rhythm
  • Wellbeing


The project has won the UNESCO Year of Light Award for being the most innovative and promising project.

Technical University of Denmark and Chief Psychiatrist Klaus Martiny at Rigshospitalet expect the project will give results that will form the guidelines for lighting in psychiatry in the future.

The project is expected to be completed in 2019. Read more here


Clinical research project – nursing home

Can circadian lighting ensure a better transfer from home to care facility while improving health and quality of life? A new research project is to answer this question.

Read more here 


Practical Evidence

Region of Southern Denmark, CoLab Health and Rehab: User survey: Aabenraa Psychiatry

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Colab Recovery & Rehab, Region of Southern Denmark, prepared the report. It is an overall assessment of circadian light on the region’s three psychiatric wards with circadian lighting – supplied by different vendors. The purpose of the report is to identify the perceived impact of circadian light on employees and patients and explain the overall experience, both at each hospital and across hospitals.

The report is available on the Region of Southern Denmark Website: (Danish only)

See spot from TV Syd that sums up – filmed in Aabenraa here (Danish only):  

The result of the report was published January 20. 2017, showing overall that the light have a positive effect on both employees and patients. Circadian Light promotes the natural circadian rhythms and sleep quality, it is comfortable to live/ work in, it creates more peace and a cozy and calm atmosphere in the evenings.

The Aabenraa hospital, which Chromaviso are behind, receives acknowledged on the focus on implementation, the amber Chromaviso night light and the high satisfaction and impact on sleep and well-being.

Quotes from the employees at Aabenraa Psychiatric Hospital:

“Many of our patients have had difficulty falling asleep at night, have been entertained by the circadian light because the dim light makes them more relaxed than normal light. It has given them a better and more restful sleep,” says chief physician Lene Høgh.

The evaluation shows that the staff have also felt a difference. This is especially true when on night duty.

“Circadian Lighting is pleasant when I have night shift because it gives a much better transition from day to night. I can feel that I have more energy in general – probably because I find it easier to fall asleep when I get home after a night shift” says Hanne Bendixen who is a nurse at the Department of Psychiatry Aabenraa.


Sønderskovhus Nursing Home, Aarhus Kommune 


Nursing home Sønderskovhus have installed Circadian Lighting from Chromaviso in 12 assisted living facilities, dining room, living room and several activity rooms.

In April 2016 Chromaviso completed a user survey among the employees at Sønderskovhus, who work in the circadian lighting on a regular basis.

13 employees answered the questions about their experiences about the lighting.

The results of the survey:

  • The employees are very satisfied with the lighting, and would recommend it. They feel less fatigue; have more energy and more peaceful atmosphere.
  • The various lighting settings are of great value. The employees use the different settings very often to calm down restless residents and to create a safe atmosphere.
  • Positive effect on the residents. The employees have experienced an effect on the residents on factors such as less aggression, less wandering about at night, better sleep, more appetite and more energy.
  • User friendly operation – in all rooms. The employees say that the operation is easy to use, and that it is important for them that the light can be operated from all rooms.
  • The night light is positive. The night shifts experience the night light positively, they can see well in the light, they can read and write, it is pleasant to be in, it creates a safe and calm atmosphere and often leads to people lowering their voices. 2 out of 3 feels it is easier to fall asleep after night shift.

Se one pager of the results (in Danish only)

Dementia Centre Aarhus, Aarhus Kommune

Dementia Centre Aarhus actively work with stimulation in a new combination of light, sound and images to calm outward-responsive dementia citizens. Results of the analysis of the use of the new therapy room shows that the tailored stimulus help the residents to calm down, reduces walking around and enhances presence and joy.

Read more here

Violet lys stimulistue
grønt lys stimulistue
orange lys stimulistue
hvidt lys stimulistue


Want to know more – get in touch: Cromaviso: +45 40804291

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