Why do we think this is an interesting area to focus on then?

There are many reasons. On the one hand, light affects our ability to see, to be able to orient ourselves, but also our ability to concentrate and learn.
an artificial light while man is biologically adapted to sunlight, natural light that we feel good about. Therein lies both a dilemma and a potential. With the right solution, both technically and functionally, we can see the light of the future in the tunnel.

“but still not fast enough for the brain to perceive that the light is on/off all the time”

Today's lights that surround us in our indoor environments consist of many different technologies, ranging from the incandescent lamp, fluorescent, halogen to LED. All of these different light sources have different unique radiance both in terms of color temperature (cold/blue tone and warm/red tone) and intensity. In addition to this, various solutions can sometimes cause discomfort, which can often be attributed to flickering. This can be difficult to detect when you do not have time to see the light turn on and off at a certain frequency, but still not fast enough for the brain to perceive that the light is on/off all the time. This is very individual, but with the right choice of various combinations of solutions, this can be solved.

Watch our videos on two previous demo installations here!
(http://futurebylund.se/post/kortfilmer-om-ljus-och-valmaende)

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Have you never had a headache at the end of the day? Your lights could be the cause!

One issue that many, verbatim, overlook is precisely flicker. Flicker occurs in slightly different ways depending on the type of lighting solution used. What produces the perceived effect is that the light source turns on and off with a certain frequency. This is done, among other things, to “dim” the lamp and the longer the “gap” between the lamps is lit, the darker the lighting is perceived.

Flickers that are experienced to give headaches vary from person to person. Moreover, in addition to the frequency of the lamp, it also depends on the type of wave used. The better wave is sinusoidal and softer while a sawtooth curve between on/off where flicker is experienced at lower frequencies than the softer sine curve as there are more abrupt switches between on/off.

By creating better lamps and fixtures that can reproduce the most natural light possible, we can improve our indoor environments. Light is dynamic which means that it changes both color temperature and intensity simultaneously over the course of the day along a predetermined curve. This curve is adapted to the location/business. For example, a color temperature of 4000 Kelvin gives better contrasts and if you go higher in color temperature (more in the blue direction), dirt is better visible when cleaning, for example. We have already tested the lights of the future in our own office which is one of our demo installations.

Some demo installations within Human Centric Light (HCL) were:

LU Open/ LTH

Here there were a total of 3 rooms included in a demo installation, 2 conference rooms + an office room with four workplaces. These three rooms were all next to each other with windows in the same direction, etc. These three demos have generated a lot of interest from all sorts of stakeholders. Everything from luminaire manufacturers to the government, authorities and installers etc to end users.

At these three demos there are three pre-programmed settings in each room.

• One with a Human Centric Lighting (HCL) curve that automatically changes both color temperature and intensity simultaneously over the day.

• A “quick demo” with this HCL curve that takes 5 minutes, so you get a good picture of how it changes during the day.

• Cleaning lights. A fixed setting for cleaning, where you can see dirt more clearly, etc.

In addition to these three preset programs, there is also the ability to set both color temperature and intensity manually.

An evaluation has been carried out, both with the existing light and with the new dynamic light.

Contact persons:
Frederick Malmberg

Polhemskolan, Lund Municipality (school halls)

Polhemskolan participated in two different demos in two different halls. One of the halls was a technical hall used by many different classes and one was a
ordinary school hall that was only used by one class in the field of language introduction. There will therefore be two types of evaluations depending on the hall being evaluated.

The process started with the students having received an education in light/lighting (regarding luminaire design and lighting from a health perspective) and then, in their course within the design specialization, they developed suggestions on how a good lighting for their halls could look like. This can possibly be implemented in these demo environments. This allows students to feel both participation in educationand the design of their own environment. The idea is that this will be a recurring event every year. It even becomes a natural deli school promotion of its own.

Contact person:
Catarina Liljegren and Fredrik Malmberg

Nyvångsskolan i Dalby, Lund Municipality (canteen)

Light can be used for many different things besides just illuminating the surroundings. One thought that was tested is whether it is possible to create a pleasant and calm meal environment with the help of light and whether this in turn can help reduce food waste.

In connection with a renovation of the dining hall in Nyvångskolan in Dalby, a new lighting installation is to be created. A lighting designer has been hired for this project and the lighting plan. When the new dining room was put into operation in autumn 2018, the new lighting was also put into operation.

This demo was also part of the project LIME.

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See also:

http://futurebylund.se/project/belysning-for-battre-larande

http://futurebylund.se/post/kortfilmer-om-ljus-och-valmaende

http://futurebylund.se/post/framtidens-ljus-redan-idag

http://lightingforpeople.eu/

‍The post was written in 2016.