With Somfy Tahoma
Somfy TaHoma

Acts as a central control hub to which you can also connect other Somfy and third-party devices.
Sunis IO

Measures light levels and triggers custom automations from the TaHoma to operate your shades.
With Your Control System
For if you’re using a system like Control4, Loxone, KNX or more.
Light Sensor
Each control system will have varying different light sensors available.
Once you connect your light sensor to the control system, you’ll be able to use it to trigger shading automations.