I have moved to a new apartment in Switzerland and it has these holes for the lights in the ceiling.

I cannot drill the ceiling as I am renting and any kind of modifications will have to be undone.

For now, as a temporary solution, I have hooked the sockets on the cables and screwed in the bulbs and there isn't enough weight, so it just hangs from wires, not elegant but it works as a temporary solution.

However, in the near future, I plan to get proper lamps, and those will weigh more, so hanging them from cables is not an option, and I am not quite sure what sort of lights I can fit into these holes or how to do it, or where even to start (my first flat in Switzerland).

Does this kind of hole have a standard name so I could google more information myself?
Is there a standard mechanism that can be hooked into these to fit any kind of light or am limited in my choices?

How to fit a chandelier or other heaver lamp into Swiss ceiling hole fitting?

I have moved to a new apartment in Switzerland and it has these holes for the lights in the ceiling.

I cannot drill the ceiling as I am renting and any kind of modifications will have to be undone.

For now, as a temporary solution, I have hooked the sockets on the cables and screwed in the bulbs and there isn't enough weight, so it just hangs from wires, not elegant but it works as a temporary solution.

(click to enlarge pictures)

However, in the near future, I plan to get proper lamps, and those will weigh more, so hanging them from cables is not an option, and I am not quite sure what sort of lights I can fit into these holes or how to do it, or where even to start (my first flat in Switzerland).

Does this kind of hole have a standard name so I could google more information myself?
Is there a standard mechanism that can be hooked into these to fit any kind of light or am limited in my choices?

How to fit a chandelier or other heavier lamp into Swiss ceiling hole fitting?