The first image shows Sky Light with AO only. The second image shows Sky Light with bent normal occlusion. Notice how surfaces in cracks 'agree' on where the lighting is coming from.
Note: Only components and lights with Static or Stationary Mobility will be captured and used for lighting with a Stationary Sky Light.
Like all types of Stationary Lights, the color of the direct lighting can be changed at runtime through Blueprint or Matinee. However the indirect lighting is baked into the lightmap and cannot be modified at runtime. The amount of indirect lighting can be controlled by