Daylight scenes utilise information provided by lux sensors to automatically adjust the scene lighting level based on the amount of light available. Daylight control can be configured when editing a basic scene by selecting Daylight control from the scene Settings. Available settings are described below:
Basic (ON/OFF) Luminaires in an active scene will fade ON or OFF (or fade to the Minimum dim level defined in the Basic ON/OFF settings) based on two configurable Lux threshold levels.
- If the measured lux is below the “Switch ON at” setting, the lights will be ON.
- If the measured lux is above the “Switch OFF at” setting, the lights will be OFF (or at the Minimum dim level setting, if this is not 0%).
Configure lux threshold values to be far enough from each other to avoid repeated or unwanted on/off operation.
The Minimum dim level is relative to the scene dim level (i.e. if Minimum dim level is 10% and the scene is at 70% then the minimum dim level will be 7%).
Open loop Luminaires in an active scene will have their output level (0-100%) adjusted by comparing the sensor's lux reading against a response graph. Sensors should not be affected by any light from the luminaires in the network. Examples: Luminaires controlled by a sensor installed in a separate location to the luminaires (e.g. outdoors) or controlled by a sensor that is facing towards a window away from the luminaires.
Closed loop A target lux level is specified. The sensor actively adjusts the luminaires in the active scene to try to reach and maintain that lux level via a feedback loop (by observing the results of its own changes). Sensors are affected by light from the luminaires in the scene. Example: Luminaires controlled by a daylight sensor that is in the same area as the luminaires.
Note that the Minimum dim level (%) setting in the Closed loop parameters applies to the closed loop scene selected. e.g., Minimum dim level set as 10% and the closed loop scene is 50%, then the minimum dimmed level for the closed loop scene will be restricted to 5% (10% of 50%).
Also, the Activation level graph option only functions for Evolution networks.
External This is similar to the open loop option but is based on a 0-100% dimming signal being sent from the sensor rather than a Lux level. This option is designed to be used to combine a Casambi unit with a sensor which is not Casambi-activated. Examples include a CBU-ASD connected to a non-Casambi sensor, or when dimming is performed by an external DALI controller or DALI 2 sensor. Casambi-ready sensors created by our partners already contain the Casambi firmware so do not need to use the External option.
When the desired Mode of operation has been selected you will then need to select the Controlling sensors and set some other parameters. The parameters to be configured will vary depending on the selected Mode of operation. Explanations of each function are included under each option field in the app. For Open loop or External modes you can configure the response graph in a similar way to a Circadian profile response graph.