Too much light!
If you are using Global Illumination, you don't need too bright light source.
It looks like you had quite a few Omni lights there, they could fill the whole space with light. When use Omni lights, use the fall off strength, so the light will get weaker to 0 intensity in a distance which will not flood fill the whole room with light.
To set up lights, it is better to remove all your lights in the scene, then put one or 2 basic lights to start, then build it up slowly. Controlling one or two light at a time is easier.