Lighting artifacts on walls

I’m completely lost now. I’ve make my uvs, everything correct, but at the moment I built the lights everything is awfully dark, close to back. I don’t understand what’s happening, so I tried making my own lighting map in maya, to make sure it was good. My walls now have two uv maps, and I setted the second (number 1) to be the used as lightmap. I also checked the onw Unreal created on its own, and it seems ok. Still, neither ot the two work, my room is completely dark now, if you want a screenshot I can post one, but since it’s imposible to see a thing I guess its not needed.
I tried moving everithing to another ñevel, with only 2 lights that I know work perfectly, and the look is the same.
Please, any help will be apprecited.