About 80 per cent of all information reaches us through the eyes. With special cells in the eye – the retinal ganglion cells – we also process non-visual information. Influenced by the colour of the daylight, these cells control the production of the hormones melatonin and serotonin in the brain and consequently the human circadian rhythm (or day-and-night rhythm). Melatonin makes us feel tired and reduces our activity, serotonin brightens our mood and motivates us.
Light is therefore the essential clock generator which ensures that we sleep well, feel well rested during the day and are fit for our daily tasks. Modern lifestyle means that we spend too little time exposed to natural daylight. The absence of this light as an important clock generator, impacts our inner clock which gets out of order. Fatigue, listlessness and, at worst, depression can be the consequence. Even seemingly brightly lit interiors are often dark from a biological point of view and unable to control our inner clock. Biologically effective artificial light is able to remedy this deficit and stabilise our biorhythm.
Targeted changes of the light colour during the day enhance our well-being and consequently improve our performance. Since all human beings have their own personal rhythms, it is vital to have the lighting adapted to the circadian rhythm of each user, to provide optimal individual support for periods of activity and periods of rest. Workplace lamps are therefore extremely efficient systems for providing biologically effective lighting.