TP-Link Kasa KS220M User Manual page 33

Customize Ambient Light Sensor Settings
It is enabled by default. If you have set Smart Control and chosen the trigger Motion Detected When It's Dark, your light will be triggered on when
ambiance setting is reached and motion is detected. Preset ambient brightness in different environment is provided and can be changed. Current
Ambiance is detected by your dimmer switch, which is a reference for you to adjust the preset ambiance values.
If Ambient Light Sensor is turned off, then the darkness trigger for your Smart Control cannot work, but the motion trigger still works.
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