The effects of daylight

Lighting is similar to daylight when the colour of the light is pure white (colour temperature is 5000-5500 Kelvins). Daylight effects us in many ways that advance our well-being, for an example in accuracy of our vision and work effectivity.


Only 100 yers ago, people spent the majority of their wake time in natural sunlight. Working life and free time have changed and modern human spends merely 10% of the time in the open air. Traditionally indoor lighting is so called warm toned light which is very yellow (2000-4000 Kelvis). Unfortunately this kind of coloured light has unpleasant but individual side-effects as headache, fatigue, lack of concentration and grumpiness.

In 1950- and 1960-centuries there was a breakthrough in studies which researched the effects of light. Scientist found, that light which contained UV radiation got plants to grow indoors in a way they never had before. Later the studies concentrated on animal testing with mouses where the results were as spectacular as before. In traditional yellow light (2400-2700K) from fluorescent tubes the average lifetime of the mouse was 7-8 months. Other mouses which lived in daylight had lifetime on average 16 months.

Today the effects of light in humans vigour and mood have been acknowledged and some of the daylight devices have even received medicinal status.

Pineal gland and melatonin


The pineal gland, also known as the pineal body, is a small endocrine gland located in the epithalamus, near the center of the brain, between the two hemispheres. One of it’s functions is to produce melatonin. Melatonin is an important hormone, which regulates the circadian rhythm of a human. The melatonin levels are at their highest at night and lowest during daytime. This means that time of a day and amount of the daylight affects the melatonin production in our brains. In summer the sunlight wakes us up in the morning, but in the winter when it’s dark outside, many people experience the wake-up much harder. We can remove this problem by using daylight lighting, which keeps us vital even on the darkest of days. In the evening we can decrease the amount of light, when it’s time to relax and prepare ourselves to bed. Lesser light is a sign for the brain to start producing melatonin and for the body to prepare to go to sleep.

State of vitality

The right amount and quality of light affects both vitality and moods via melatonin. When we feel easy in the mornings it can be noticed that the whole day is more vital and vibrant. In the evening we dim the lights and go to bed relaxed. When the day has been vibrant, we are naturally tired in the evening and falling asleep is easier. The sleep is also deeper and better. After a good night’s sleep we wake up well rested and vivacious. And so the great sleep pattern is made. Melatonin produced by pineal gland is also known to be connected with mood, behaviour, hormone production, metabolism and growth factors.

Visual acuity

Pure white daylight shows colours and contrasts really precisely. For example reading and other exact chores, becomes easier with adequate lighting, where it’s needles to squint. This in turn diminishes headaches and other strains.

If the colour scheme of our environment is twisted, our eyes and brain tries to fix these circumstances which causes excessive work and leads to fatigue. That’s why quality, great colour rendering and natural hue of the light really matters.

The effects of daylight have been tested among students and classrooms and it’s been noticed that learning results improved remarkably in dayligt. When the sight got better also the reading speed of the students increased. Daylight also kept the students vivacious during the whole school day, which led to better concentration and increased interest in learning.

Light in interior

”Magnificently designed lighting can spice up an ordinary interior and a gorgeous one can be ruined with poor lighting design.”

Features of a quality lighting:

  • Transformability
  • Adequate luminosity for different actions
  • Non-dazzling
  • It shows the colours of interior in its real hue
  • It supports the residents well-being
  • Solutions favour the architecture and style of the space
  • It emphasizes the best parts of the space

Besides the sight, lighting has two other tasks concerning the interior. Properly located lights can create atmospheres and bring up details of the interior. In addition to this the lighting itself can be a pretentious decorative element.

In lighting design, we delve into technical executions, customer desires, style and look of the apartment, and existing frameworks and pieces of furniture which are going to be highlighted. It’s worth to delve into the lighting of your own apartment, because when it succeeds, it’s a solution that could bring you joy, well-being and light for many years to come. When you’re considering the lighting in your home, contact us without hesitation. Our expert lighting designers are more than happy to help you with your worries and questions about lighting.