The city engineers decided to use recessed 600 mm x 600 mm panels fitted with LEDs. The 40W panels could change colour temperature from 2,700K to 6,500K. The change in intensity and colour temperature is automatic, but they could also be dimmed using a Dali system controlled from a wall switch in the classroom.
An automatic light variation pattern was developed based on a Master’s degree dissertation aiming to combine scientific knowledge and user preferences, see diagram below. Those gradual changes of light intensities and colour temperatures were programmed by the city’s engineers.
You can see that the maximum illumination level and Coolest colour temperature is in the morning when the children first arrive in school. It then becomes Warmer and with a lower illumination level around midday.