systems. Good design can make it easier to interpret and navigate a building safely, and the use of colour and contrast can be used in different ways to help with this. Key considerations include: illumination; CCT/colour (spectral composition); glare control; contrast control; visual clues; reduced flicker; active changes in illumination and colour, and active sensing to ensure comfort, safety, and efficient energy use. The colour of the light is also very important. Modern LED lighting can provide new ways to improve indoor lighting to mimic the effects of sunlight and the modulation of light and colour (CCT) to provide beneficial circadian effects. Human-centric lighting technology, such as that developed by Luxonic Lighting, which uses smart LED lighting systems with sensors, will lead to significant changes in our use of indoor lighting, and many studies have shown significant benefits in those who have little choice but to work or live

Dr Gareth Jones

Dr Gareth Jones PhD is an entrepreneurial technology professional with a broad knowledge of photonics, electronics, medical devices, lighting, and associated technology, gained over 25 years. He is currently chairman of LUX-TSI, an independent accredited testing services company, and CEO of LUX-IEC, a technical consultancy, and focuses on energy, lighting, and electronic products. He was group CTO of LED lighting company, Enfis PLC, from 2001-2010.

indoors, as well as in those who experience poor sleep patterns due to the indoor lighting systems currently used. Through adaptation of the mix of colour and the intensity of light at different times of the day, this artificial light can mimic or even improve the light necessary to maintain a good circadian rhythm, leading to better sleep patterns and enhanced wellbeing.


A study undertaken by Mariana Figueiro PhD, a professor and director at the Lighting Research Center at the Rensselaer Polytechnic Institute in New York, found that lighting can significantly reduce sleep disturbance, depression and agitation.1 The study involved 43 people with Alzheimer’s disease and related dementias, who were exposed to an active and inactive tailored lighting intervention for successive four-week periods. The lighting, which consisted of tuned

and dynamic colour temperature, output and distribution, was installed in areas in which the group spent most of their waking hours, and was lit from wake-up time until 6 pm. The study considered a mix of CCT and light levels. Measures of sleep disturbance (Pittsburgh Sleep Quality Index), mood (Cornell Scale for Depression in Dementia), and agitation (Cohen- Mansfield Agitation Index), were collected at baseline and during the last week of the lighting intervention. While all measures improved, the most significant improvement was seen in sleep quality. The preliminary findings of the study showed that choosing the right lighting can improve sleep, mood, and behaviour, in people with Alzheimer’s disease.

Reference 1 Figueiro MG. A proposed 24 h lighting scheme for older adults. Lighting Research & Technology 2008; 40 (2): 153-60.


Lighting Research Centre [ programs/lightHealth/index.asp]. •This article was adapted from a presentation on the impact of lighting on wellbeing and how lighting schemes can improve the symptoms of dementia through the creation of calming effects and the alignment of the lighting with people’s circadian rhythms, which was undertaken on behalf of Luxonic Lighting at the Dementia Care and Nursing Home Expo at the NEC in March 2018.




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