References for my lighting mostly came from Star Citizen and Alien Covenant, with dashes of things like Alien 3 and Lone Echo. Had a bit of trouble with lightmap seams and textures not reacting well to static lighting, but it worked out alright. I also made a couple of small material tweaks - e.g. making the carpet & beds use a Cloth shading model, adding a very slight emissive to the window glass.
Follow my "Learning Lighting Art" progress @ http://polycount.com/discussion/190402/ue4-learning-lighting-art