Since I started this thread I’ve discovered a couple of things that may be obvious to more experienced users but may be of help to some.

 The UberEnvironment 2 is a kind of area light, in that it is a sphere which encloses the scene and emits light from whole internal surface. If UE2 is introduced into a large scene, it appears as a sphere which has to be increased in size (scaled up) until it encloses the whole scene and the cameras. Some options bias the lighting to a particular direction, which can be changed with the light’s rotational controls

A colour map can be applied to this inner surface, which controls the colour emitted by the surface, as in the case of the HDR presets that come with DS4. For example, using a simple map of three vertical stripes of red, blue, and green produces a psychedelic stage/ nightclub lighting.

 I haven’t had much success with the Uber area lights and now use UE2, and the normal DS4 lights to produce the modelling.