UE4 Dark Scene still lit with flickering light

I tried to do some dark basement parts in my new project and stumbled accross something weird. I got a Room without light and put a point light in there with some flickering involved (Setting the intensity randomly from 0 to 100),

This is how it looks like when the intensity is at 100: enter image description here

And this when the intensity is at 0: enter image description here

As you can see there is still a rest light in there and the room is far away from being dark when the light is off. I already turned off Environmental Lighting and the whole eye adopt post process thing. I also deleted any directional light as it seems to cause lighting problems with dark sections.

Is there maybe another thing about the point light other than the intensity to be turnd off so there is nor more light emitting?

Hope you got a quick tip for me!