Tutorial on youtube: https://youtu.be/eVPuvCAEz4Q
Download the example files: https://gumroad.com/polygonacademy
This quick blockout/lighting study was made for a tutorial to demonstrate how you can use emissive materials to influence your lighting in UE4. They bake to the lightmaps and volumetric lightmaps so moveable meshes benefit as well. This entire scene is lit by the emissive and 1 small spotlight at the end of the hall.
Lighting with EMISSIVE Materials in UE4 - Unreal Engine Tutorial