Daylight-controlled Lighting Adjusted for Geographical Orientation : Effects on Recovery, Energy Consumption and User Satisfaction (DIM Light)

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.

Study Overview

• Status: Active, not recruiting
• Conditions: Light

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 Type: Observational
• Enrollment (Estimated): 900

Contacts and Locations

Study Locations

• Denmark
  • Copenhagen, Denmark, 2100
    • Mental Health Centre Copenhagen
  • Sjælland
    • Copenhagen, Sjælland, Denmark, 2400
      • Ny Psykiatri Bispebjerg

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

• Sampling Method: Non-Probability Sample

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.

Description

Inclusion Criteria:

• patients being 18 years old or older
• patients having a duration of stay of at least 3 days in the wards

Exclusion Criteria:

• patients that have switched room during their stay
• patients that have been in rooms where the lighting wasn't working

Study Plan

How is the study designed?

Number of groups / cohorts

2

Cohorts and Interventions

Group / Cohort
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 the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Duration of stay	Number of day of the stay of the partient in the closed ward of NPB (Ny Psykiatri Bispebjerg)	The 2 periods consecutive winter period (2022 and 2023)

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Use of psychotropic medication	The mean use of psychotropic medication (in mg/day) during the two periods	The 2 periods consecutive winter period (2022 and 2023)

Collaborators and Investigators

• Sponsor: Mental Health Services in the Capital Region, Denmark
• Collaborators: Elforsk

Study record dates

Study Major Dates

• Study Start (Actual): November 21, 2022
• Primary Completion (Estimated): April 1, 2026
• Study Completion (Estimated): April 1, 2026

Study Registration Dates

• First Submitted: May 11, 2023
• First Submitted That Met QC Criteria: May 11, 2023
• First Posted (Actual): May 22, 2023

Study Record Updates

• Last Update Posted (Actual): May 11, 2025
• Last Update Submitted That Met QC Criteria: May 9, 2025
• Last Verified: May 1, 2025

More Information

Terms related to this study

• Keywords: Sleep; Energy Consumption; Chronotherapeutics; Built environment; DIM Light
• Other Study ID Numbers: DIM Light

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No