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Use light sensors to adapt luminaire power to the current daylight level. In daylight harvesting, the light intensity in the room is kept constant and luminaire power will automatically adjust adjusts to a given value of light intensity.

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5. Go to the Daylight Harvesting node. Select the Feedback group which is controlled and gives feedback on the current intensity value (lux value). Set the number of luxes intensity in the Daylight Harvesting value [Lux] field and choose toleration (in luxes)tolerance.

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Note that the value of luxes intensity in the Daylight Harvesting may not correspond to the actual brightness intensity on e.g. the desk. You should do a quick calibration. Use lux meter to measure the brightness intensity on the desk.

How to do the daylight harvesting calibration

  1. Set brightness in the vertex action node to get e.g. 500 luxes lux on the desk - measure this using a lux meter.

  2. Note the Illuminance level below the DALI2 Devs Common node in the Node-RED workspace.

  3. Enter this value in the Daylight Harvesting Value field in the daylight harvesting node.

  4. If you need, check other configurations e.g. 1000 luxes lux and create a table with values.

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