Installation example – smartSWITCH corridor with absence dampening

Premises without natural daylight usually need the lighting to be switched on continuously. However, in some cases some of the luminaires can be switched off when no one is in the room. Light control is ideal for corridors where the sufficient basic light can be quickly increased during occupancy. Energy savings can be up to 80 %.


  • Luminaires with Tridonic PCA ECO or Excel one4all.
  • e-Sense luminaire with smartSWITCH sensors can be used.
  • HF ballasts learn the automatic function the first time it is used.
  • External standard occupancy sensors can be combined in the system.

Proposal for the installation of control in the corridor

Lighting is usually continuously lit in corridors where people normally move around. Examples are hospital culverts and corridors in large building complexes. Many installations have been made more energy efficient by detecting occupancy and the movements of individuals and with that switching on the lighting when necessary. The negative effect of this type of control is when you approach a darkened room the reaction time of the sensor is then decisive for how quickly the lighting is switched on.

The combination of poor detection with the slow starting of the fluorescent lamp creates a scenario where the user enters the corridor before the lighting is switched on. Creating a feeling of displeasure and uncertainty. This can also have a negative effect on the life of the fluorescent lamp. Short ignition times result in lamp end blackening and a reduced life span.

If you know the lighting should always be on you can ensure that the lighting is on at a high level with occupancy and then reduced to a low energy-saving level awaiting the next detection. By regulating between high and low levels the cathodes are not consumed and the life span of the fluorescent lamp is not negatively affected. Absence dampening time delays can be as short as one minute to regulate back to a low level.

The advantage of this type of control is that a central control unit is not necessary. Occupancy detectors are connected directly to the control input on the HF-ballast. After an on-pulse (occupancy) of 5 minutes the HF-ballast has changed function to adjust between 100 % with occupancy (230 V on the control input), and 10 % light with absenteeism. If you know that the room/corridor will not be used during certain parts of the day, for example in schools, you can switch off the lighting completely with the help of central control. See the wiring diagram below.

Absence dimming with Occupancy detectors and HF-ballast PCA ECO-lp

Connection for automatic control between 100 % (occupancy) and 10 % (absenteeism). The HF ballast PCA ECO-lp recognises that these properties are required and adjusts the standard switchDIM function automatically. The time can then be shortened on the occupancy detectors to give maximum functionality. Luminaires equipped with e-Sense switchDIM can be used in combination with external occupancy detectors.

If luminaires with compact fluorescent lamps are used, the luminaires should be equipped with PCA EXCEL One4all HF-ballasts. The same phase to luminaires and sensors. A large number of luminaires can be controlled simultaneously as there is no output via the relay function. Switching can be controlled centrally, for example via a time switch.