- Project plans
- Project activities
- Legislation and standards
- Industry context
- Specialist wikis
Last edited 27 Jan 2021
Lighting for circadian rhythms
Lighting for circadian rhythms was written by Dr Paul Littlefair and Dr Cosmin Ticleanu and was published by the BRE Trust in October 2019. It is free to download at: https://www.bretrust.org.uk/wp-content/uploads/sites/12/2019/10/Circadian-Lighting-Trust-report-2019_29_10.pdf
People have circadian rhythms linked to the natural light/dark cycle of the day. These control patterns of alertness and sleep as well as other factors such as body temperature and the release of various hormones. Light and dark patterns act as the most important signal to entrain (synchronise) the circadian clock to the solar cycle and cause waking and sleeping to occur at consistent times.
A combination of bright light during the day and darkness at night helps maintain the daily cycle of waking and sleep. However, exposure to artificial light at the wrong times of day can have an adverse effect on circadian rhythms. Light at night time can alter the body clock, suppressing melatonin production and keeping people awake at night, and making them more sleepy during the day.
Circadian lighting varies in colour and intensity during the day. The aim is to improve alertness during working hours using bright light, but to switch to lower brightness, warmer coloured light before it is time to relax.
Its contents are:
- Colour of light.
- Dynamic lighting: previous studies.
- Existing recommendations.
- An experiment to assess variable lighting.
- Conclusions and recommendations.
 Related articles on Designing Buildings Wiki
- 7 ways better lighting can improve your health.
- BRE articles.
- BRE Expert Collection 6 Daylight and shading.
- BRE Trust.
- BREEAM External lighting.
- BREEAM Internal and external lighting.
- BREEAM Reduction of night time light pollution.
- BREEAM Visual comfort Daylighting.
- Building Research Establishment.
- CIBSE Case Study Hepworth Gallery Lighting.
- Circadian rhythms.
- Colour Rendering Index CRI.
- Daylight benefits in healthcare buildings.
- Health and wellbeing impacts of natural and artificial lighting.
- Human-centric lighting.
- Lighting and health FB 74.
- Lighting and health infographic.
- Types of lighting.
- Use of lighting to improve health and wellbeing.
Featured articles and news
Smart motorway strategies.
Actuate UK urges change of deadline to at least December 2022.
Study shows harmful impact of late payments on SME personnel.
Upcoming changes to the commercial supply and purchase of chemicals.
CLC introduces card for learners.
CIOB members recognised for public procurement.
Experts discuss the complex issues damaging the supply chain.
The co-founder of Get Kids into Survey discusses career paths for kids.
Report examines lack of detail in the Government's vision.
Our director Gregor Harvie hosts 4 webinars at the IHBC marketplace on Friday.
Look up construction terms on any website direct from your browser.
The revival of the public sphere in Toronto.
The story behind the copycat architecture craze.
Insight into construction materials supply and demand issues.