Working with the tutorial, I built the house, added the textures, saved it, now I added a 'light' in the middle of the floor. Rebuilt it - File > Build WMB

Then I Previewed the Level - I am still getting the full lightning however, I do see the pool of brighter light on the floor. Is the engine suppose to automatically adjust the lighting (go darker) when you add a light (except for the spot of light) or is there some adjustment in settings I have to make somewhere?

Thank you!

I have found the answer to this myself, using the sun setting you can tone down or up the overall lighting, but this effects all lighting on the level, inside and out so judge carefully.