LIGHTING & LIGHTING CONTROLS
The benefits of circadian lighting in the workplace
In recent years, there has been a growing awareness of the importance of lighting in indoor environments. Beyond its traditional role in providing visibility, lighting can also have a significant impact on our mood, productivity and overall well-being. This is where the concept of circadian lighting comes into play – and it could change the way we illuminate our commercial buildings in the future – writes Phil Wiltshire, of Pensdown, the electrical company
O
ur bodies follow a natural 24-hour cycle known as the circadian rhythm. This internal clock regulates various physiological processes, including sleep-
wake cycles, hormone production and body temperature. Light plays a crucial role in synchronising our circadian rhythm with the external environment – and we know that it already plays a huge role in helping to promote good mental health. Exposure to bright light during the day helps suppress the production of melatonin, a hormone that promotes sleep. Conversely, exposure to dim light in the evening signals to the body that it’s time to wind down and prepare for sleep. By incorporating circadian lighting into indoor
environments, we can optimise our body’s natural rhythms and reap numerous benefits, particularly improved sleep quality. Exposure to bright light during the day and dim light in the evening, further helps to regulate sleep-wake cycles, leading to more restful nights. Circadian lighting can enhance alertness, concentration and mood, leading to improved productivity and job performance. It is a more natural light, which has been linked to reduced symptoms of depression and anxiety. Studies have shown that by incorporating
circadian lighting, we can create a more positive and uplifting work environment. It can also improve cognitive function, including memory, attention and problem-solving skills. This is particularly important for knowledge- based workers and students. Furthermore, circadian lighting systems can be designed to minimise glare and flicker, reducing eye strain and fatigue.
Companies have a responsibility to create healthy and productive work environments for their employees and by investing in circadian lighting systems, they can demonstrate their commitment to staff well-being and create a competitive advantage. It is a development which is gaining momentum.
As an electrical contractor we have noticed an increased demand from companies seeking to install circadian lighting to enjoy the benefits it offers. As we have already discussed, we know that by improving employee alertness, concentration and mood, circadian lighting can lead to increased productivity and reduced absenteeism.
A well-lit and comfortable work environment can also boost employee morale and job satisfaction and companies that prioritise employee well-being are more likely to attract and retain top talent. It can also be shown that by improving employee health and well-being, circadian lighting can help reduce healthcare costs associated with stress-related illnesses.
Circadian lighting – a guide for companies
That said, the successful implementation of circadian lighting in the workplace requires careful consideration. The type of lighting used can significantly impact the effectiveness of circadian lighting systems. The colour temperature of light is measured in Kelvin (K). Warmer colours (2700K-3000K) can promote relaxation and sleepiness, while cooler colours (4000K-6500K) can increase alertness and focus. By adjusting the colour temperature throughout the day, circadian lighting systems can mimic the natural light
cycle – and this is what we try to achieve when installing these systems. The intensity of light, measured in lux, also plays a crucial role in regulating circadian rhythms. Exposure to bright light during the day can suppress the production of melatonin, while dim light in the evening can promote sleepiness. This means that to effectively mimic the natural light cycle, circadian lighting systems should be adjustable. This allows for changes in colour temperature and intensity throughout the day, ensuring optimal exposure to light at different times. It is therefore highly recommended to consult with lighting design experts like us, who can assess the specific needs of the workplace, recommend appropriate lighting solutions and ensure that the system is installed and calibrated correctly. By carefully considering these factors and seeking expert guidance, companies can implement effective circadian lighting systems that promote employee advantages such as, well-being, improved productivity and a healthier work environment. There is no doubt that optimising our exposure to light has a profound impact on both our physical and mental well-being. As already mentioned, light plays a crucial role in regulating our circadian rhythm — the internal body clock that controls sleep-wake cycles, hormone production and overall energy levels. Forward-thinking companies are recognising these benefits and investing in circadian lighting to create healthier and more productive work environments. Circadian lighting systems are designed to mimic the natural progression of daylight, providing cool, blue-toned light in the morning to enhance focus and warmer tones in the evening to encourage relaxation. This approach helps to regulate employees’ sleep-wake cycles, reducing fatigue and improving concentration throughout the workday. When employees are more alert and less stressed, they are naturally more productive and engaged in their work. Companies that prioritise employee well- being through investments in circadian lighting are not only improving working conditions, but also strengthening their business performance. Reduced absenteeism, increased productivity and higher employee satisfaction contribute to a more motivated and cohesive team. Furthermore, happier employees are more likely to stay with a company, reducing recruitment and training costs. Ultimately, happier companies are more profitable companies. When employees feel valued and supported, they are more willing to invest their energy and creativity into their work, driving innovation and long-term business success.
30 BUILDING SERVICES & ENVIRONMENTAL ENGINEER MAY 2025 Read the latest at:
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