For those of you who haven’t been able to get emissive lighting to work I made a quick video. No narration, just watch my mouse cursor, I start with an empty map using only the starter content.
The two gotchas are you should switch lighting quality to “production” in the build menu and after your scene is set up you should switch view mode from “Lit” to “lighting only” and then back to “Lit”. Otherwise UE4 thinks there are no light sources in your scene and will render the scene as “Unlit”.
https://.com/8IUB35OjLGI