The Psychological Effect of Light

How does light influence our psyche and mood?

The specific mechanisms by which light affects people, and the biological processes it influences, have been the subject of many scientific studies. Two modes of action are relatively well documented: Light entering through the eyes affects the production of the hormone melatonin and influences our circadian system. Contrary to popular belief, melatonin is not purely a "sleep hormone", but regulates our internal clock. The correct release of melatonin at the right time (when it is dark) is crucial for a healthy day-night rhythm and therefore for our mental wellbeing. 

Artificial lighting in the workplace has a direct impact on this rhythm. Poorly designed or low-quality lighting can disrupt the internal clock, leading to sleep disturbances and, in the long term, significant psychological stress. Modern lighting concepts are therefore placing greater emphasis on the biological effect of light to support health and wellbeing in the workplace.

What kind of light makes us tired, and why?

Daylight changes throughout the day. Studies show that bright, cool light at midday can help boost alertness, while exposure to artificial light in the evening or at night can throw our internal clock out of sync. Since the discovery of special light receptors in the eye in 2001, we now have a better understanding of how color temperatures interact with our biological clock. In addition to color temperature, the quality of light also plays a crucial role. Inferior lighting, particularly flickering light which consists of rapid, often unconscious fluctuations in brightness – can strain the eyes, leading to fatigue, impaired concentration, eye discomfort and premature exhaustion. High-quality workplace lighting should offer both the right color temperature at different times of day and a uniform, flicker-free quality of light.

What impact does poor lighting have on our bodies?

Inadequate lighting in the workplace can lead to a range of psychosomatic complaints that are often underestimated. The most common issues include fatigue, sleep disturbances and headaches, which can have a long term effect on productivity and well-being. Flickering lighting places a constant strain on the visual system, even when the flickering is not consciously noticed. This constant strain can cause headaches and concentration problems. At the same time, a lack of sufficient indoors lighting often leads to increased tiredness and listlessness - especially during the darker winter months. Inappropriate lighting can disrupt the circadian rhythm and, over time, contribute to chronic sleep disorders.

What makes an optimal workplace lighting solution?

Professionally planned lighting does more than just create ideal visual conditions. It also helps form an attractive working environment that aligns with the latest scientific findings on the non-visual effects of light. The impact of lighting on our circadian rhythm is now well understood and is being increasingly factored into modern lighting design. 

Current technical standards offer concrete guidance in this regard. They help to develop lighting solutions that promote both visual comfort and biological well-being in the workplace. Color temperature plays an important role here: warm white light in the evening supports relaxation, while daylight-white light in the morning and around midday promotes alertness and concentration.

How can users improve the quality of light in the office?

It is important the users can easily adapt lighting to suit their individual needs and work context. According to DIN EN 12464-1, this includes controllable light intensity that can be varied within a defined lighting corridor. The ability to adjust light colour is also increasingly important for workplace wellbeing. Professional lighting design recognizes that too much individual control can lessen the intended biological benefits. A balanced lighting concept should therefore offer the right mix of personal preference and scientifically informed recommendations. High-quality office lighting is defined by flicker-free operation, excellent colour rendering. High-quality office lighting is characterized by flicker-free light, good color rendering and effective glare control. These factors play a key role in preventing fatigue and increasing wellbeing during working hours.