how to change type (light, heater, blower, other, etc) of socket without re-adding it

B3rt

When adding a new (z-wave) device Homey ask what kind of device is plugged in (light, heater, blower, other etc)

When chosen, added and save how do i change this?

A related question is:
 when i give the voice command 'alle verlichting uit' Homey switch off lights, how does it know if the socket used contains a light and not (for example) a refrigurator or other device (which is not a light).

I believe that it is 'linked' to the type of socket you specify when adding the device, therefore my first question:
- how can i see what kind of device is linked to the socket
- how to change this kind of device (without re-adding it)

caseda

It is linked to how you included it, it will get a so called class that is being addressed to it to make those voice commands work (you already gave your own answer, but anyway)
So light attached = class light
Other attached = class socket
Etc
You should see a small bulb on the icon (bottom right) if it is a light

and you can only change it when re-pairing it (for now) 
Since it does more then just assign the class behind the scenes.