Light in Healthcare Environment (Ljus i sjukhusmiljö) (LIS)

November 24, 2025 updated by: Lund University

Benefits of Light in the Radiographic Environment

The goal of this clinical trial is to learn if light can enhance the feeling of well-being and sleep quality in Radiographers. It will also find out if there is an optimal recipe for light. The main questions it aims to answer are:

  • Will alertness, energy levels, and sleep quality increase in radiographers when the lighting is differed?
  • What light recipe is the most beneficial for the personnel? Researchers will compare no enhanced light environment to different enhanced light environment to see if the enhanced light is beneficial for radiographers.

Participants will:

  • Will work in an enhanced light environment or a non-enhanced light environment
  • Answer surveys
  • Take saliva sample

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Detailed Description

The aim of this study is to examine the impact of different daylight lighting conditions in the radiographer's workplace environment. Will alertness, energy levels, well-being, and sleep quality increase in the personnel at the radiology department when the lighting is differed? Which light recipe is the most beneficial for the personnel at the radiology department? Method Design: In order to ascertain the light level that yields the desired effect, an quasi-experimental study design will be employed to identify the optimal light recipe with the appropriate light intensity. A crossover design is intended for implementation. This design approach offers the advantage of having each participant serve as their own control, thereby minimizing the potential impact of inter-group differences on the results. Furthermore, it enhances statistical efficiency, even with a reduced number of study participants (Lim & In, 2021).

Context/recruitment: Recruitments of personnel from various radiology departments at Skåne University Hospital (SUS) in Lund are planned to be conducted. A total of 18 the personnel at the radiology department will be included during the darker months of the year. At 10 to 20 workstations, a floor lamp equipped with an adjusted light prescription will be installed. Participants will be assigned to conditions in which the lamp will either be activated with the specified light recipe or remain turned off. After a duration of two weeks, the conditions will be reversed for an additional two-week period. This process will be repeated using four different light recipes to evaluate their effects on the energy levels, activity, and sleep quality of the staff. The objective is to gather insights from each season that can be implemented in the subsequent winter to determine the optimal light level.

Data collection: Subjective Measurement Methods - Staff Surveys

General Survey Participants will be asked questions regarding their typical age and gender. Additionally, a modified version of the Morningness-Eveningness Questionnaire (MEQ) will be utilized to determine each individual;s chronotype (Adan & Almirall, 1991). A Swedish translation of this questionnaire has proven effective in assessing chronotype and is appropriate for use when a shorter assessment tool is needed (Danielsson et al., 2019).

Karolinska Sleepiness Scale (KSS) To assess the level of alertness and energy among study participants, the KSS will be utilized. This scale employs a 9-point Likert format to evaluate perceived fatigue and energy levels (Åkerstedt & Gillberg, 1990). The KSS has been utilized in various research studies to examine the impact of lighting conditions on perceived alertness.

Patient-Reported Outcomes Information System Short Form Sleep Disturbance 8a(PROMIS) The Patient-Reported Outcomes Measurement Information System (PROMIS) is an assessment tool designed to measure self-reported sleep disturbances, including sleep quality, difficulty falling asleep, and staying asleep. It consists of 8 items rated by patients to evaluate the frequency and severity of sleep issues, supporting clinical insights into sleep-related health impacts.

Furthermore, participants & well-being will be quantified utilizing the WHO-5 Well-Being Index.

Objective Measurement Methods: Sleep Data via Activity Bands - Actiwatch

The employment of activity monitors allows for the objective measurement of sleep. The actigraphy device is worn on the non-dominant wrist and is non-invasive (Weiss et al., 2010). It continuously tracks the participant's movements and records sleep parameters including duration and quality. These measurements can subsequently be analyzed (Ancoli-Israel et al., 2015). Due to the impracticality of wearing these wristbands during working hours, participants will attach them to their clothing at work and wear them on their wrist after work hours.

Additionally, saliva samples will be collected to measure cortisol and melatonin levels in the study participants. Cortisol secretion is stimulated by dawn light or, in winter, often by office lighting. This secretion level provides an objective parameter for assessing activation. Conversely, melatonin secretion is suppressed by the light of dawn, and the extent of this inhibition serves as an indicator of the lights effectiveness.

Study Type

Interventional

Enrollment (Estimated)

18

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Locations

  • Sweden
    • Skåne County
      • Lund, Skåne County, Sweden, 22242
        • Recruiting
        • Skånes Universitetssjukhus Lund
        • Contact:
      • Malmo, Skåne County, Sweden, 21428
        • Recruiting
        • Skanes universitetssjukhus
        • Contact:
      • Trelleborg, Skåne County, Sweden, 23155
        • Recruiting
        • Lasarettet Trelleborg
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

Yes

Description

Inclusion Criteria:

Radiographer

Exclusion Criteria:

-

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Prevention
  • Allocation: Non-Randomized
  • Interventional Model: Crossover Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Active Comparator: Enhanced light environment
Device: Light enhancement
Light recipe that mimics the varying daylight of the day
Other Names:
  • Lamp
  • Light recipe
  • Dynamic lighting
No Intervention: Non-enhanced light environment

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Karolinska Sleepiness Scale (KSS)
Time Frame: Measurements will be taken three times daily over a period of 16 to 20 weeks, depending on the start date of the inclusion phase, for each period.
To assess the subjective level of sleepiness at a particular time during the day
Measurements will be taken three times daily over a period of 16 to 20 weeks, depending on the start date of the inclusion phase, for each period.
WHO-5 Well-Being Index
Time Frame: Measurements will be taken at the start and then second Friday in each two-week period over the 16 to 20 weeks (depending on when the inclusion phase can begin) during which inclusion occurs for each season.
To assess the level of well-being, the WHO-5 Well-Being Index is used. It's a brief, self-reported measure of current mental well-being, consisting of five questions that assess positive mood, vitality, and general interest over the past two weeks.
Measurements will be taken at the start and then second Friday in each two-week period over the 16 to 20 weeks (depending on when the inclusion phase can begin) during which inclusion occurs for each season.
PROMIS
Time Frame: Measurements will be taken at the start and then every Friday in each two-week period over the 16 to 20 weeks (depending on when the inclusion phase can begin) during which inclusion occurs for each season.
Patient-Reported Outcomes Measurement Information System (PROMIS) is a standardized, self-reported questionnaire designed to measure an individual's perception of their sleep quality, specifically addressing issues like difficulty falling asleep, staying asleep, and feelings of restlessness. It consists of 8 items that gauge the severity of sleep disturbances over the past seven days.
Measurements will be taken at the start and then every Friday in each two-week period over the 16 to 20 weeks (depending on when the inclusion phase can begin) during which inclusion occurs for each season.

Other Outcome Measures

Outcome Measure
Measure Description
Time Frame
Melatonin
Time Frame: Measurements will be taken on Mondays, Wednesdays, and Fridays each week over the 16 to 20 weeks (depending on when the inclusion phase can begin) during which inclusion takes place for each season.
Melatonin levels will be measured through saliva samples throughout the day to assess the variations in melatonin.
Measurements will be taken on Mondays, Wednesdays, and Fridays each week over the 16 to 20 weeks (depending on when the inclusion phase can begin) during which inclusion takes place for each season.
Cortisol
Time Frame: Measurements will be taken on Mondays, Wednesdays, and Fridays each week over the 16 to 20 weeks (depending on when the inclusion phase can begin) during which inclusion takes place for each season.
Cortisol levels will be measured through saliva samples throughout the day to assess variations in cortisol values, allowing us to observe, e.g, variations in stress responses.
Measurements will be taken on Mondays, Wednesdays, and Fridays each week over the 16 to 20 weeks (depending on when the inclusion phase can begin) during which inclusion takes place for each season.

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Lund University

Collaborators

AFA Insurance

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

November 15, 2024

Primary Completion (Estimated)

March 31, 2027

Study Completion (Estimated)

March 31, 2027

Study Registration Dates

First Submitted

November 4, 2024

First Submitted That Met QC Criteria

November 12, 2024

First Posted (Actual)

November 13, 2024

Study Record Updates

Last Update Posted (Actual)

December 2, 2025

Last Update Submitted That Met QC Criteria

November 24, 2025

Last Verified

November 1, 2025

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 2024-04436-02

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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