SCHOOL MAINTENANCE & DESIGN
back to people. The occupancy detector can gently and unobtrusively support both the performance and the well-being of the room users.
Few components are required for HCL light control in a school. The sensor includes an integrated tunable white function. No additional controller is needed to control the light colour - the occupancy detectors can be connected directly to the luminaires. The panel luminaires in the modular ceiling of the office must, of course, be designed for colour change. The LED panel luminaires are equipped with warm white and cool white LEDs that can be controlled separately. The LED driver operates according to the DALI Device Type 8 Standard for Tunable White. This not only allows the luminaire to be dimmed, but also allows the colour temperature to be freely adjusted from warm white (2,700K) to cool white (6,800K). With installation and commissioning, the lighting in schools is completely tailored to the needs of the room users. Like other DALI occupancy detectors, HCL sensors control different luminaire groups based on presence and daylight, covering an area of up to 24 m. Up to 64 DALI electronic ballasts can be controlled via the detector.
The sensor contains the luminaires for the main light which can be divided into three groups and be given offset values. This compensates for brightness differences in the room, for example if the room has windows on one side only. The percentage gradation of the brightness of the luminaire groups from the wall to the window ensures that the darker wall area is more strongly illuminated than the brighter area at the window. This means that the room is uniformly lit everywhere.
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www.education-today.co.uk June 2024
There is a separate zone for DALI group which is intended for accent lighting, for example for blackboard lighting in classrooms. A third zone is controlled by a switching relay integrated in the detector that can be used, for example, to connect the air conditioning system. In this way, the ventilation can also be controlled depending on the presence of people.
After grouping the luminaires, the HCL lighting control system can be put into operation. The pre-programmed factory settings cover the most common requirements but can be overwritten individually. All connected luminaires are controlled energy- efficiently by the occupancy detector. The measured brightness value is used to add only as much artificial light to the natural light entering through the window as is actually
needed to meet the required brightness in the room.
In essence, HLC sensors automatically control the light colour and brightness in the room over the course of the day. According to the use of the room, pre-set application profiles can be selected. They operate completely independently thanks to its real-time clock and integrated DALI controller. This allows each classroom or room to be configured individually. The change in light colour from warm to cool white and the change in brightness are based on the biological rhythm of human beings. This happens very slowly and imperceptibly for the users, just like with natural light. That is how the biological light effect of the sun is brought into the office.
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