I'm back to discredit my first suggestion about how to fade-to-black within
POV-Ray. Lights and ambience are probably about as poor a choice for doing
such a thing with that I can think of. It was a spur of the moment answer,
sorry.

Perhaps the best way would be to use a tiny sphere encompassing the camera,
its location set to the camera's. A texture for it like so:

texture {
    pigment {
        rgbt FB
        }
    finish {
        ambient 0 diffuse 0
    }
}

where FB goes from 1 to 0 over the duration. Hopefully that wouldn't have
any side effects on the rest of the scene. Would also solve the problem of
this working with emitting media and high pigment values which might be used
in objects.

BTW, in case you were actually asking how to fade from one scene to
another... that could prove difficult. Theoretically, you could add a
transmit to each and every object of two separate sets of scenes and
increase the transparency while decreasing the other; however, surface
finishes and coincident surfaces could prove a problem and need further
attention.

A workaround might be to put a transparent plane between the scenes, camera
looking directly into it and seeing only one scene. Then increase reflection
in the finish of that plane to 100% to see only the second scene that is
placed directly behind the camera. Main problems to overcome there is angle
of reflection (which isn't too much of a problem), perspective (due to angle
of mirror), and lights (solvable using light_group).

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