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Light and relaxation

27. 1. 2016 Blog Honza

kategorie - Osvětlení domácností

A few days ago, I finished reading the book Čas pro světlo (Time for Light) by Professor Helena Illnerová, in which she writes about the influence of light on the human organism. She says that the perception of light significantly affects our circadian rhythm, the so-called “biological clock”. For example: if you are under artificial light at a time when your brain is accustomed to sleep, it hampers the formation of melatonin in the epiphysis, which induces night for your organism. Moreover, if the so-called “blue element” prevails in the light, this negative effect is much more significant.

How can you use such information in practice? Your bedroom and the rooms where you relax after work, which are usually a living room, wellness facilities, etc., should have a light source with a colour temperature of 2,700 K (i.e. incandescent white) – you use it for lighting before you go to bed or when you want to relax, which is very efficiently facilitated by this light. Conversely, during the day in the study, office, as well as in the kitchen, you need “daylight”, i.e. a source with a high colour temperature of 4,000–7,000 K, which stimulates serotonin, the nerve chemical that supports the wakefulness cycle. If, for various reasons, you want to use LED light sources, it is beneficial if they exhibit a high colour rendering index, e.g. CRI> 90 or Ra > 90, which means that you see colours almost as in daylight or under a standard light bulb, whose Ra is 100. In addition, if you have trouble sleeping, you shouldn’t stare at your computer monitor or LED TV before you go to bed, because they have a large proportion of the aforementioned blue element.

And how can you use light to relax best? Should you choose the dim light of a reading lamp or an intense “warm” light all over the room? Here’s advice from a lighting designer: “The best way to relax is being in the dark.” In today’s world, overlit by all sorts of technology, it is the dark that is the right balm and luxury for your well-being. Treat yourself to it.

Jan Petráň / PAIRAM