LightDIM LightNCT05868291
Daylight-controlled Lighting Adjusted for Geographical Orientation : Effects on Recovery, Energy Consumption and User Satisfaction
An observational study of Light, run by Mental Health Centre Copenhagen, Bispebjerg and Frederiksberg Hospital at 2 sites in Denmark.
Trial summary
The trial takes place in 4 psychiatric closed wards at Ny Psykiatri Bispebjerg. The objective is to compare, retrospectively, over two consecutive winter periods (2022 and 2023) the effect of the lighting on the duration of stay of the patients. Read more about this study
- Who is it for?
- Ages 18 years and older
- Conditions the study is for
- Light
- How many people
- 900 participants
- Where
- 2 sitesDenmark
- Study dates
- 21 Nov 2022to Apr 2026
- Phase
- Observational
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- All sexes
- No healthy volunteers
- Adult, Older adult
Study population: Patients above 18 years old that have been hospitalized in one of the 4 closed wards of NPB during the 2 study periods.
Who may be able to join
- patients being 18 years old or older
- patients having a duration of stay of at least 3 days in the wards
Who cannot join
- patients that have switched room during their stay
- patients that have been in rooms where the lighting wasn't working
Trial locations and contacts
2 sites in 1 country.
Denmark2 sites
Ny Psykiatri Bispebjerg
Copenhagen, Region Sjælland, 2400
Mental Health Centre Copenhagen
Copenhagen, 2100
About this study
The trial takes place in 4 psychiatric closed wards at Ny Psykiatri Bispebjerg. The objective is to compare, retrospectively, over two consecutive winter periods (2022 and 2023) the effect of the lighting on the duration of stay of the patients. During the first winter, a standard lighting is used, and, during the second winter, the lighting will be modified to favor a greater light intensity in blue wave color light in the morning and a gradual decrease in light intensity in the evening adjusted for geographical orientation of the patients' rooms.
Read the detailed description
Light has benefits in many pathologies, especially in psychiatry and sleep disorders. It is the most powerful Zeitgeber, allowing a drive of the sleep-wake rhythm. But what are the "doses or quantities" of light necessary for humans to stimulate circadian regulation? And how is it possible to promote better people's exposure to this amount of light during winter (especially in Nordic countries where daily light exposure during winter is particularly reduced: 8 hours on average)? At the Bispebjerg Hospital, following the installation of LED lighting, a dynamic system favoring a greater light intensity in blue wave color light in the morning and a gradual decrease in light intensity in the evening adjusted for geographical orientation of the patients' rooms is evaluated. This device was effective on anxious and depressive symptoms for patients hospitalized after a stroke. Here, we'll study the effect the light may have on patients in psychiatric closed wards. Moreover, we'll assess the users' satisfaction and the energy consumption of the system.
If the described intervention is associated with a reduction in the duration of stay of the patients in the ward as well as with a general satisfaction of the users and that it consumes much less energy, one could think of the installation of this system on a large scale not only in hospitals but also in schools or other public buildings where it could be interesting to have this adapted lighting.
- Conditions
- Light
- Keywords
- DIM Light, Sleep, Energy Consumption, Chronotherapeutics, Built environment
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
| Study group | Role | What they receive |
|---|---|---|
| Group 1 | During the period going from November 2022 to March 2023, data from all the patients (approx. 500) hospitalized in the 4 closed wards will be collected (duration of stay, medication use...). The group 1 will be exposed to the standard lighting system in Bispebjerg Hospital. | |
| Group 2 | During the period going from November 2023 to March 2024, data from all the patients (approx. 500) hospitalized in the 4 closed wards will be collected (duration of stay, medication use...). The group 2 will be exposed to the new lighting system that will have been optimized (higher intensity and blue content in the morning and progressively dimmed light after 14:00). |
What is being measured
The primary outcome is the main question the study is designed to answer.
Duration of stay
Number of day of the stay of the partient in the closed ward of NPB (Ny Psykiatri Bispebjerg)
Measured: The 2 periods consecutive winter period (2022 and 2023)
Secondary outcomes (1)
Use of psychotropic medication
The mean use of psychotropic medication (in mg/day) during the two periods
Measured: The 2 periods consecutive winter period (2022 and 2023)
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted22 May 2023
- Study start21 Nov 2022
- Primary completionApr 2026 (estimated)
- Study completionApr 2026 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (1)Papers the sponsor has linked to this study.
- Other trials for LightStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Cohort
- Time perspective
- Retrospective
- Enrolment
- 900 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Mental Health Centre Copenhagen, Bispebjerg and Frederiksberg Hospital
- Sponsor type
- University, hospital or other
- Collaborators
- Elforsk
- Responsible party
- Sponsor
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT05868291
- Sponsor's protocol ID
- DIM Light
- Acronym
- DIM Light
- Status last verified
- May 2025
- First submitted
- 11 May 2023
- Last updated
- 11 May 2025
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
Publications
Volf C, Corell DD, Hansen TS, Dubois JM, Zeng X, Baandrup L, Petersen PM, Martiny K. Effects of dim-evening lighting optimised for geographical orientation versus standard lighting on mental health: protocol paper for a quasiexperimental study in a psychiatric hospital. BMJ Open. 2024 Oct 10;14(10):e086658. doi: 10.1136/bmjopen-2024-086658.
PubMed 39389598
Study at a glance
From the registry record, last updated by the sponsor on 11 May 2025. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Daylight-controlled Lighting Adjusted for Geographical Orientation : Effects on Recovery, Energy Consumption and User Satisfaction
- ClinicalTrials.gov ID
- NCT05868291
- Acronym / sponsor ID
- DIM Light / DIM Light
- Conditions
- Light
- Keywords
- DIM Light, Sleep, Energy Consumption, Chronotherapeutics, Built environment
- Study type
- Observational
- Recruitment status
- Active, not recruiting
- Enrolment
- 900 participants (estimated)
- Lead sponsor
- Mental Health Centre Copenhagen, Bispebjerg and Frederiksberg HospitalUniversity, hospital or other
- Collaborators
- Elforsk
- Study start
- 21 Nov 2022 (actual)
- Primary completion
- Apr 2026 (estimated)
- Study completion
- Apr 2026 (estimated)
- First posted
- 22 May 2023 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The trial takes place in 4 psychiatric closed wards at Ny Psykiatri Bispebjerg. The objective is to compare, retrospectively, over two consecutive winter periods (2022 and 2023) the effect of the lighting on the duration of stay of the patients. During the first winter, a standard lighting is used, and, during the second winter, the lighting will be modified to favor a greater light intensity in blue wave color light in the morning and a gradual decrease in light intensity in the evening adjusted for geographical orientation of the patients' rooms.
Detailed description
Light has benefits in many pathologies, especially in psychiatry and sleep disorders. It is the most powerful Zeitgeber, allowing a drive of the sleep-wake rhythm. But what are the "doses or quantities" of light necessary for humans to stimulate circadian regulation? And how is it possible to promote better people's exposure to this amount of light during winter (especially in Nordic countries where daily light exposure during winter is particularly reduced: 8 hours on average)? At the Bispebjerg Hospital, following the installation of LED lighting, a dynamic system favoring a greater light intensity in blue wave color light in the morning and a gradual decrease in light intensity in the evening adjusted for geographical orientation of the patients' rooms is evaluated. This device was effective on anxious and depressive symptoms for patients hospitalized after a stroke. Here, we'll study the effect the light may have on patients in psychiatric closed wards. Moreover, we'll assess the users' satisfaction and the energy consumption of the system.
If the described intervention is associated with a reduction in the duration of stay of the patients in the ward as well as with a general satisfaction of the users and that it consumes much less energy, one could think of the installation of this system on a large scale not only in hospitals but also in schools or other public buildings where it could be interesting to have this adapted lighting.
Study design
- Observational model
- Cohort
- Time perspective
- Retrospective
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Group 1 | – | –During the period going from November 2022 to March 2023, data from all the patients (approx. 500) hospitalized in the 4 closed wards will be collected (duration of stay, medication use...). The group 1 will be exposed to the standard lighting system in Bispebjerg Hospital. |
| Group 2 | – | –During the period going from November 2023 to March 2024, data from all the patients (approx. 500) hospitalized in the 4 closed wards will be collected (duration of stay, medication use...). The group 2 will be exposed to the new lighting system that will have been optimized (higher intensity and blue content in the morning and progressively dimmed light after 14:00). |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
- Study population
- Patients above 18 years old that have been hospitalized in one of the 4 closed wards of NPB during the 2 study periods.
Key inclusion criteria (2 listed)
- patients being 18 years old or older
- patients having a duration of stay of at least 3 days in the wards
Key exclusion criteria (2 listed)
- patients that have switched room during their stay
- patients that have been in rooms where the lighting wasn't working
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Primary outcome
Duration of stay
Time frame: The 2 periods consecutive winter period (2022 and 2023)
Number of day of the stay of the partient in the closed ward of NPB (Ny Psykiatri Bispebjerg)
1 secondary outcome
Use of psychotropic medication
Time frame: The 2 periods consecutive winter period (2022 and 2023)
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 11 May 2025.
- Derived from this study: PubMed 39389598Volf C, Corell DD, Hansen TS, Dubois JM, Zeng X, Baandrup L, Petersen PM, Martiny K. Effects of dim-evening lighting optimised for geographical orientation versus standard lighting on mental health: protocol paper for a quasiexperimental study in a psychiatric hospital. BMJ Open. 2024 Oct 10;14(10):e086658. doi: 10.1136/bmjopen-2024-086658.
Related trials for Light
Active, not recruiting
Feasibility of Home-Based Intermittent 60Hz Light Therapy for Major Depressive Disorder (MDD)
Depression, MDD
Active, not recruitingPhase 2
Siltuximab to Decrease Symptom Burden After Autologous Stem Cell Transplantation for Patients With Multiple Myeloma and AL Amyloidosis
Multiple Myeloma, AL Amyloidosis
Not yet recruiting
The EYERISING Study
Myopia, Astigmatism
RecruitingPhase 2
Study of HBI0101 (NXC-201) CAR-T Therapy in Multiple Myeloma and Light-Chain Amyloidosis
Multiple Myeloma, Refractory to Standard Treatment, Multiple Myeloma, Relapsed
RecruitingObservational study
Objective Depth-of-Focus Changes During Light Adjustable Lens UV Adjustments
Light Adjustable Lens, Objective Depth of Focus
Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
2 sites in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Light, run by Mental Health Centre Copenhagen, Bispebjerg and Frederiksberg Hospital at 2 sites in Denmark.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 2 inclusion and 2 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: under way, not looking for participants, as of the sponsor's last update on 11 May 2025. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 2 sites in Denmark. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Duration of stay (time frame: The 2 periods consecutive winter period (2022 and 2023)). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT05868291, which also lists 1 linked publication.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 11 May 2025.