An essential guide to Human Centric Lighting

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More specifically it affects the production of melatonin, cortisol and serotonin. If you’re exposed to daylight all day, the balance between these three hormones will change naturally, harmonising the sleep cycle with the rise and set of the sun. But in the modern world it can often be hard to get sufficient exposure to daylight during a work week,

a challenge that may manifest itself in poor sleep quality, less than optimal performance, tiredness and a poor mood. With Human Centric Lighting we use artificial light to recreate the positive effects daylight has on our sleep/wake cycle, performance and mood.

What can Human Centric Lighting do for me?

The short answer is that Human Centric Lighting can improve your sleep, performance and well-being. The longer answer is that Human Centric Lighting solutions produces light that influences the hormone production in the body.

A good night’s sleepHuman Centric Lighting can improve the circadian rhythm and sleep-quality by adjusting the hormone balance in the body. This is something everyone can benefit from, but it is especially important for vulnerable groups like adolescents, shift workers, psychiatric patients and people with dementia.

Be at the top of your gameHuman Centric Lighting can improve performance by enhancing the ability to concentrate, increasing alertness and reducing fatigue, which in turn can lessen the number of errors made at work.

Increased well-beingHuman Centric Lighting increases the sense of well-being because it affects mood and sleep quality. Users of HCL solutions report that they feel healthier, more energetic and happier.

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What is Human Centric Lighting?

Human Centric Lighting (HCL) are solutions that can produce light of different colours, colour temperatures and intensity in order to provide ideal visual working conditions in challenging environments and/or stimulate the human circadian rhythm.

Ergonomic lightingSolutions in which lighting technology is used to produce light of different colours in order to create ideal visual working conditions.

Biological lightingLighting solutions that mimics the qualities of daylight to enhance human performance, wellbeing and to support a favourable circadian rhythm.

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What does a Human Centric Lighting solution consist of?

LED luminaires with tuneable white technology that allows the colour temperature and intensity of the light to be adjusted.

A Light Management System which is used to create a time cycle for the different light settings and the options for manual override when desired.

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What does a Human Centric Lighting solution consist of?

Know-howof the four different HCL parameters - spectrum, intensity, timing & duration and distribution.

Hormones that are affected by light

The ganglion cells in the retina send signals to the brain and regulate hormone production. The three most important hormones that control the biological rhythm are:

• Melatonin makes you tired, slows the body functions and lowers activity in favour or earned rest.

• Cortisol on the other hand is a stress hormone that is produced from about 3 am. It stimulates the metabolism and programs the body for day mode.

• Serotonin works as a stimulant and motivator. While the cortisol level in the blood drops throughout the day and thereby acts counter-cyclic to the melatonin level, serotonin helps elevate energy levels.

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How is Human Centric Lighting implemented?

In order to install and program efficient Human Centric Lighting solution, four parameters require careful attention: spectrum, intensity, timing & duration and distribution. Each parameter may be changed as long as one or more of the other parameters are adjusted accordingly.

SpectrumWe know that the blue wavelengths in the light are the biologically active parts. For this reason, we use cool white light sources with wavelengths in the blue spectrum to stimulate the body in the morning and as a boost when high concentration and alertness is needed. In the evening warm white light can aid relaxation and rest.

Intensity Research has taught us how much light is needed to influence the biological processes in the human body. We need to choose solutions that provide enough light to achieve this, while taking care of issues such as unwanted glare and energy consumption.

Timing and duration Light in the morning is the most effective. It tells our biological clock that the day has begun and that bodily functions need to be activated. Conversely, light exposure in the evening will cause melatonin production to be suppressed and make it harder to fall asleep. It is important that we take these factors into consideration when planning a Human Centric Lighting solution with a 24-hour cycle.

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DistributionFor light to have a biological effect, our eyes need to be able to perceive bright areas in the room as effectively as possible. Because melanopsin-containing ganglion cells are particularly sensitive in the lower and nasal part of the eye, bright planar lighting in the upper part of the visual field is recommended. This can be achieved with:• large-area luminaires or luminous ceilings• luminaires casting indirect light over large areas, so that the ceiling and the upper third of the walls are illuminated• lighting with indirect light components on room elements and furnishings.

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You will find a lot more information about Human Centric Lighting by visiting our web site.

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Kongsgårdmoen Primary School, Kongberg, NorwayKongsgårdmoen school was one of the first schools in the world to install Human Centric Lighting based on LED products. All classrooms are equipped with HCL. The solution provides an intensive, cool white light in the morning and during concentration activities, and a warm white light at the end of the school day, as well as for relaxation and group discussions. This will support the pupils’ natural circadian rhythm, reduce sleep disturbances and improve concentration.

Human Centric Lighting in educational institutions:

St. Olavs Hospital, psychiatric ward at Østmarka, Trondheim, NorwayAt the new Østmarka psychiatric ward in Trondheim, light is used in the treatment of manic-depressive patients. Research shows that the absence of blue wavelengths, so-called blue-blocked light, can provide immediate, positive effects on this patient group. This light will be orange from 6.30 p.m. to 8.00 a.m. The solution features premium Glamox LED luminaires, with an advanced management system where lighting settings are carefully programmed. The light for each patient can also be manually controlled by the staff.

Human Centric Lighting in hospitals and healthcare facilities:

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Aker BP, Trondheim, NorwayAker BP (formerly Det Norske Oljeselskap) in Trondheim has built one of the first onshore control rooms for the operation of a North Sea offshore production platform, adapted for 24-hour operations. A light cycle has been designed for the control room that contributes to the best and fastest possible daily rhythm adjustment. This occurs through exposure to light with high intensity and cool colour temperature during the first two to four hours of the night shift. Afterwards, the light shifts to a neutral white colour and medium intensity. During the day shifts, employees are exposed to a cool white light in the morning and after lunch. This lighting solution will help keep operators alert and concentrated.

Human Centric Lighting for industrial applications:

Human Centric Lighting for offices:Sparebank 1, Nord Norge, NorwayAs one of the first banks in Europe to do so, SpareBank 1 Nord-Norge is installing Human Centric Lighting consecutively in several of its finance centres in Northern Norway. At their new premises in Mo i Rana, the lighting system in the team rooms for the 36 employees are preset according to a fixed day cycle. In the morning when the staff arrive at work, the lighting is warm white and the lighting strength is around 400-500 lux. After a while the lighting shifts to cold white and lighting intensity is increased to 800 lux, before it is lowered again, and turning warmer towards lunchtime.After lunch the blue-white tones increase again, before they decline towards the end of the day, and the warm white light becomes more prominent. In the meeting and quiet rooms it is possible to adjust the light in three categories – normal lighting (4000 kelvin, 500-lux), calm lighting (3000 kelvin, 500-lux) and focus lighting (6000 kelvin, 800 lux).

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Human Centric Lighting research projects

Glamox closely monitors research related to Human Centric Lighting. We have also chosen to be more directly involved in selected projects. Below is an overview of projects to which we have contributed with products and/or competence on lighting.

St. Olavs Hospital psychiatric ward, Østmarka, NorwayBlue-Blocked Light is used in the treatment of psychiatric patients in order to mitigate symptoms like manic episodes and sleep disturbances.

Research Institutions: Norwegian University of Science and Technology and St. Olavs Hospital

PILCS (Personalized Intelligent Lighting Control Systems), HollandA project that tested the effects of different lighting regimes on office workers’ wellbeing, sleep, performance and evaluations.

Research Institutions: Eindhoven University of Technology

TUV School, NorwayDynamic lighting in a school. Effects on sleepiness, attention and sleep in 8-10 year old children.

Research Institutions: Haukeland University Hospital and the Norwegian Competence Centre for sleep Disorders

DEM.LIGHT, NorwayA project that aims to boost the development of light therapy as a ceiling-mounted solution for the treatment and rehabilitation of dementia patients.

Research Institutions: University of Bergen

Shift work simulation experiments, NorwayThe project comprises three laboratory studies where different lighting scenarios in terms of colour temperature, lux levels and monochromatic vs. full spectrum light was applied to students simulating night shifts. The studies monitor the effect on alertness, cognitive performance, sleep duration and sleep quality.

Research Institutions: University of Bergen, Haukeland University Hospital and the Norwegian Competence Centre for sleep disorders.

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You will find a lot more information about light management systems by visiting our web site.

Human Centric Lighting and light management systems

A prerequisite for Human Centric Lighting solutions is sophisticated light management systems. The light management system is used to set and adjust a custom time cycle for the intensity and colour temperature of the light. It can also be used for individual control of workplace lighting or to allow for manual commands to override a cycle. Glamox offers light management systems on different levels of complexity and will help you tailor a solution that is both functional and user friendly.

© G

lamox

June 2019

The Glamox Group

Glamox is a Norwegian industrial group that develops, manufactures and distributes professional lighting solutions for the global market.

Quality brands and solutionsThe Group owns a range of quality lighting brands including Glamox, Aqua Signal, Luxo, Norselight, LINKSrechts, Küttel and Luxonic. Glamox is committed to meeting customer needs and expectations by providing quality products and solutions, service and support.

Technology and expertiseOur products and solutions are developed and tested by our engineers at our own research and testing facilities, and manufactured and certified in accordance with all relevant quality and environmental standards. They are based on the latest technology and expertise – and generations of experience.

www.glamox.com/uk

The sunlight varies in colour and intensity over the day. At daytime the cool white light contains a lot of activating blue light. Towards the night it has a warm white hue.

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