Using unmodified 4.5 here. Adding a stationary Directional Light appears to be the only way to light a skeletal mesh with direct light on mobile. You can only use one Directional Light in the scene as others will be ignored by the skeletal mesh.
I’ve found that any type of point lights or spot lights will not light skeletal meshes with direct light at all.
Yeah I had the same thought - I’m not sure what to do about indoor scenes. Any Epic devs with some ideas about how to light skeletal meshes indoors on mobile - if we can’t use spot or spotlights?