Towards Human Centric LEDlighting

13 12 2015
The impact of light on our well-being has made us more aware of the different lighting solutions. By changing the intensity and colour temperature of light we can impact on mental alertness and comfort.

Non-visual effects of light depends critically on the intensity, the duration and the spectral composition of the light. Also the prior light exposure and the timing of the exposure determine the kind and size of the non-visual effects that can be achieved.

Human centric lighting is becoming more common. The new technology updates enable cost effective and user friendly solutions. Human Centric Lighting is the inclusion of visual and non-visual (biological) needs of humans in the design of lighting applications.

The lighting is changing quickly. For the new lighting projects is LED lighting today the best option. LED prices have dropped and the quality is improved.

Lighting can be used to increase the labor productivity, the welfare of the people, comfort and safety. You can also use new technologies to improve energy efficiency.

Light with a high spectral blue component activates and increases the capability for performance and concentration. If this blue component in light decreases, the body relaxes and changes over to a calm phase. Light control offers further positive effects on the human biological rhythm. It is able to improve motivation, the ability to concentrate and therefore productivity as well, and it provides ideal support with intellectual tasks.

George Brainard, the director of the Light Research Program at Thomas Jefferson University, hopes his research on how the colour of light is interpreted by our eyes will be able to get patients out of the hospital sooner. Maybe the order should be changed, so that millions of suffering people could benefit earlier from his findings as soon as possible.

Lighting the Learning Environments

The use of Human Centric Lighting is not only suitable for the medical-therapeutic sector, but also for school and office. It is, however, the only competent lighting design that enables the optimal utilization of new intelligent lighting solutions.

The newest way to school lighting is to move the teaching and the kids outdoors. Excellent experiences, especially from England and Sweden, have been made. If the outdoor learning is not possible one day because of the bad weather, education traditionally takes place inside the classroom.  However, ensure that the lighting inside is similar to the outside one, that is daylight simulating light, 5,500 K with high colour rendering index, over 90.

The school’s main goal is to get the pupils to learn. So the Human Centric Lighting is very important in schools. However, most of the schools are illuminated by a traditional, warm, tired light (mostly 3000-4000 K).

It has been known that the full spectrum of sunlight increases the reading speed  by up to 20%, and reduces eye fatigue. So daylight is the best option for schools.

According to the most recent studies, the daily outdoor activities may reduce the need for children’s short-sightedness eyewear. This article was provided by the Journal of the American Medical Association (JAMA).


The following is an extensive article, click the link:

Transforming Outdoor Learning in Schools

Good lighting design always meets the customer’s individual needs. My role is to provide the best solutions. With over 30 years of experience, I served thousands of satisfied customers.

Most of my clients choose a natural daylight for the interior lighting. If you have a lighting project for your work place or home, I would like to help you to get a modern, Human-Centric LED lighting.

However, you can also choose a solution, where you can choose the light colour from e.g. 2,700 to 5,500 K.

Before you read more, here is my new article from the housing fair in Finland, with many pictures about the human centric home LED lighting.

Spectrum is the most important thing to decide on the light quality. I prefer a 5,500 K continuous daylight spectrum, however, in the evening you could choose warmer light in order to sleep better.

Good daylight spectrum   11

Bad, non-continuous spectrum  fluorescent 1

Some benefits of human-centric lighting

To promote the safety of the working environment lighting and ergonomics.

More information about Human Centric Lighting:




Children’s day-care center got health-promoting lighting

9 03 2014
In April 2014 in Turku was opened children’s day care center. It is lighted with full spectrum Viva-Lite daylight lamps.
  • 74 pcs 580 mm Jasmina plafonds, 2×36 W lamps
  • 8 pcs 800 mm Jasmina plafonds, 2×55 W lamps
  • 23 pcs plafond with presence detector, 2×18 W lamps
Full spectrum daylight lighting has many benefits. The colors and seeing accuracy are excellent, the reading speed is faster than in normal lighting. The light that has effects on health, it is especially important for children.
The children grown under daylight are less myopic and have less eye glasses
This has been showed by Australian and Swedish studies. The best light is, of course, full spectrum daylight outdoors. Also artificial full-spectrum daylight is useful if there is not enough real daylight. e.g. in winter time. Therefore, we recommend that the homes and schools would be illuminated with a stronger  daylight-like light and ask children to stay more in a real outdoor daylight. The longer a child stays outdoors in daylight, the better the vision he gets.  This is evident from the studies by Dr. Kathryn University of Sydney .
Children growing in daylight lighting has even less myopia, that means, the eye glasses are not often  needed .
Stockholm University study shows how important it is to study under full spectrum lamps. Full spectrum  lamps can help tired children. The survey found that schoolchildren were sharper. They were also more active during the day. In the evening, before going to bed, they were more tired. Movement monitors also revealed a better and more peaceful night’s rest.
Here are pictures of daylight Jasmina luminaires.  The lighting has got a lot of positive comments. It differs so much from the traditional.
Jasmina luminaires meets the needs of even the most difficult aspect of ergonomics and gives a pleasant smooth and efficient lighting. Because of the opal cover the brightness is low, and does not dazzle.
In 2015 a similar children’s day-care center will be lighted with full spectrum LED lamps.
More information 
Daylight effect on eye development. Dr. Kathryn research from the University of Sydney
Stockholm School Survey, University of Stockholm stress the Institute’s research

My full spectrum daylight ideas may be unique in the whole Europe.

30 09 2012

I like to learn a lot of lighting you never seen before:

  • Indirect lighting with different light shelves
  • Lighting through opal plastic panels
  • Disguising of the basic light fixture on opal plastic
  • Bar light fixture, indirect light in the middle of room
  • Daylight LED panels, dimmable or non-dimmable
  • The newest LED products, LED tubes, E-27, GU10, MR16, E-14, GX53, panels

How to light different rooms at home

  • Lighting of the hall
  • Lighting of the kitchen
  • Lighting of the living room
  • Lighting of the nursery, childproof lighting which increases reading speed and lighting which reduces the fatigue of eyes
  • Lighting of the utility room and of the piece of clothing room
  • Lighting of the toilet
  • Lighting of the bathroom, high-quality mirror cupboard
  • Lighting of the workroom
  • Lighting of the stairs
  • Lighting of the sauna
  • Lighting of a technical state and warehouse
  • Lighting of the home theatre
  • Outdoor lighting
  • Lighting of the negotiation room

Avoid spot lamps and down light lamps, especially in families with children.

Here is a bad and good example.

There was planned near 100 pieces of led lamps (or halogens) in the ceiling. Because there was three children in the family, we took a red pencil and stoke all the down light lamps away. If a child lies on the floor, his eyes goes directly to the brightest light on the ceiling and can see the light several minutes. This is not a healthy situation.

The family tested our indirect lighting and the result is this:

Excellent example of lighting plan

Indirect light in the living room, all bed rooms, kitchen and working room. And when it comes direct lighting (led panels or plafonds), the diameter of the luminaire should be at least 300 mm. If it is only 50 mm or smaller, the light causes bad blending.

Collect a group of  5 – 20 persons, I will keep the lecture on the subject, which is suitable to you.

  • Lighting of the home and colours
  • Daylight as interior decoration element of the home
  • Lighting of the home – the most important interior decoration element
  • Lighting which increases work satisfaction and industrial safety

We tell about the significance of the daylight light as interior decoration element of a home and job. You see good examples of the separate premises of the home which have been lit well and stylishly. Up for discussion there are undazzled alternatives of the direct and indirect lighting and examples of the traditional ways to light also. With the lecture it is dealt with

  • significance of the lighting planning in building and decoration. In the comparison it also is traditional and ledLED lighting.
  • I advise how to choose the right lamp to home and to job.

The lighting ideas are emphasised

  • advantageous
  • energy saving
  • child safety and fire safety
  • in work lighting raising of the vigour state and improvement of industrial safety and feeling happy with the lighting

Read more.

The spectrum of lighting is the most important at school lighting

11 02 2012

In a few schools around the world, is currently some testing going on, a new kind of school lighting. Variable factors are lux amount and color temperature. It is said to bring major benefits for example  in reading speed. That would be excellent.

Color temperature options are from 2900 to 12000 K. The teacher can change the lighting in the classroom at will. A variety of lighting situations is considered to be too much for some teachers and they would like to make it easier. It is excellent that schools pay attention to lighting.

Unfortunately, the most important thing has been forgotten. The light spectrum is the most important thing for lighting-related work, including child development, learning. It would be interesting to see the experimental spectra of the light tubes used in classes. I suspect that the spectrum is incomplete, like this:

3-band light spectrum

3-band light spectrum

The spectrum should have been complete, continuous, like this.

Full spectrum

Full spectrum

It is known that one-sided light, for example, yellow light, is harmful to humans. In school lighting those four color temperatures, two of which are yellowish, 2900 and 4000K, are one-sided (not full spectrum) light. 12 000 K is already the second end of the color temperature: the light is blue. 6000 K is also somewhat blue. There are no long-term studies of how a child develops under one-sided (non-full spectrum) light. However, there are studies, where yellow light causes health problems.

Instead, under full-spectrum daylight lighting conditions, from which a true daylight is the best example, children’s physical and mental development is as complete as possible, when considering the effect of light.

Children need all the wavelengths of light, so that for example endocrine glands develop normally and growth in height goes such as each child’s growth hormone secretion allows.

I believe it´s irresponsible to make human experiments in which pupils are tested with 3-band light. At least the matter should be discussed with the children’s parents and teachers. These experiments can be compared with, if vitamins and minerals are removed from the school food. After all, they do not affect the flavor of food.

Special lighting, with four different color temperatures, costs around 4000 – 5000 euros per classroom. If a new class is equipped with high-quality lighting and full-spectrum lamps, the cost is around  2000 – 3000 euros. If there already is fluorescent lighting in the class, the cost for replacement light tubes, full spectrum daylight lamps,  is around 240 – 480 euros depending on the size of the class.

I would argue that full-spectrum daylight lamp lighting achieves better educational results than illuminating the children with different-colored lamps.

The light should have a positive influence on health. Basel University researcher Christian Cajochen says that artificial light can also have a very negative impact. Light should be approached as drugs. It should be of correct constitution and also be taken by right doses.

Who is responsible if school children´s development is disrupted due to the lack of the acceptable light spectrum?