@PascalVdV 

Two actions are required in your case, one to turn on the light and hub alarm, and the other one to turn off the light (siren duration is supported for the tapo hub).

Simply create a different automation to turn off the light then apply "Delay" to this rule.

E.g. When Light A turns on, Then turn off Light A. Delay 3 minutes.

If you're using the testing App of Smart Action 2.0, this scene can be achieved with one automation rule, as the "Delay" feature can be added as an Action in between the other actions. The automation can be created as follows.

When T100 motion detected

Then

- Turn on Light A

- Ring Tapo Hub for 3 minutes

- Delay 3 minutes

- Turn off Light A

  @PascalVdV 

Unlike the dedicated light switches with motion sensors, smart light bulbs themselves do not have this kind of design. It would take extra work if you want a regular device to cater to this kind of usage.

  @PascalVdV 

I see. Actually this feature will be available soon in the upcoming Smart Action 2.0. "No motion detected for a Set Time" will be available as a Trigger for T100 in the smart action.