Plentiful Office lights on the market. The “butler” floor lamp from light plan differs from them, that she will be delivered with a preset course of daylight. It is an adaptation of the light color, a curve that is designed to meet the requirements of the dynamic lighting in the Office throughout the year. Daylight is changed in the course of the year: the sunrise or the sunset moves by several hours, and by the varying angles the amount of light in the summer differs from in the winter. This curve can be only a compromise that should be as practical and suitable procedures in the Office.
The default course of daylight of the floor lamp “butler” is based on the circadian rhythm, can be but changed and adapted by the user to his needs (human centric lighting).
What light at what time?
The first requirement for the acceptance of a dynamic solution for healthy light is a good lighting design will be given unspecified here. This verifies that the light intensity required in the construction projects is ensured. In the Office are artificial lighting – 500lx which may not be less than on the work surface. Because in most cases, the lighting design to this minimum value set out in the DIN standard is designed, not dimmed the brightness in the standard daylight curve for offices.
Several daylight patterns for healthy light in use, which differ according to their use are market. In the health sector, for example, the light intensity plays a major role, and illuminance levels far beyond 500lx in individual sectors are not uncommon. Daylight patterns for hospitals or retirement homes contain a Dimmkurve that in addition to the dynamic colour temperatures. Dynamics has prevailed in the Office area in the color temperature.
Change the color temperature in the context of the human centric lighting there are two trends that good light “Day synchronization” and “Activation” is called the funding community.
Day light synchronization, where throughout the day the color temperature of the light in the Interior is adapted to what is happening outside the window, under the open sky, is achieved by curves, providing continuous change throughout the day. The morning and evening are important phases for the daily synchronization of internal clock by light. The sensitivity of the light sensitive receptors in the eye is highest in the morning. In the evening, blue light can signal a longer day and thus later avoid falling asleep.
A clear disadvantage of Bell-shaped curves leading from morning/warm white lunch/Daylight-White to evening/warm-white, is to meet not the circadian rhythm of the people. The coolest colour temperature is not reached in the morning, when it is needed but only at noon, when the need for cool light already removed hat1und in addition that most offices are unused.
The lighting concept “Activation” is characterized by periodic changes in the color temperature and intensity. The change is also subjectively felt called so-called light showers.

For special applications, this special light impulses are advisable, it should be used but wisely and with the consent of the employee, so that the positive offer of activation, workload and motivation through healthy light does not become the secret influence or manipulation.
When the preset day light curve of light plan is a hybrid: in the morning with a course quickly and activating in the Daylight White starts (6500 K), then no further activation takes place but, but the light simulates daylight over the course of the day, until the color temperature to the sunset on a level close to the spectrum of fire (2700 K) is lowered.

The user study “Light work” of the Fraunhofer Institute has tested for two years the acceptance of dynamic lighting in offices. It noticed that held 80% of the use of lighting in the winter and in this time of year warmer light colours are accepted prefers and works better. Also find morning cooler temperatures than in the evening acceptance and that it is essential for the users to have an easy way of the intervention in the lighting control system found in the study. Only automatically controlled lighting fell through in the acceptance study in all subjects.
Application for plan light
The circadian plan light curve for the floor lamp “butler” serves the daylight synchronization of the employees to make an as healthy and stress-free work environment. The preset curve contains activating tips only in the morning. The circadian rhythm of the people below and aligned with the needs of the user in the Office the curve begins with a rapid rise to 6500 K in the morning and decreases in the course of the day on a less blue-containing neutral white (5200K). 2700 K – for constant illuminance – be achieved towards evening.

The proposed curve begins at sunrise or shortly before. 6500 K in the Interior be achieved, if the light of day in the open air has high intensities (golden hour).
In the summer the morning color temperature to warm would perceived. Users can then manually set the light color of the light, or use the of day light abundant at this time.

Based on the needs of the people in an Office environment (human centric lighting), as well as on the actual use of lighting, could be developed a usable all year round course of daylight with the “butler” plan light floor lamp can be delivered now pre-programmed.