Here's a quick example animation of a spotlight shone upon a rotating box
while the camera rotates to face the pointing direction around to the light
source  (into shadow of box) direction.  Each of the 3 media methods is used in
succession.  The camera just jumps back to the start each time the method is
changed.  The media scattering uses type 5 Henyey-Greenstein eccentric haze (of
0.25) for all with the settings of media all the same so as to see the
differences only of the method.
  Starting with 1, the granular and most dusty, is the usual official POV-Ray
media.  Method 2 only shows this same dust when looking back at the spotlight
through the box shadow and otherwise has noticeable color banding like a
highcolor (16bit or lower) display screen does.  3 is smoothed yet still has
almost imperceptable banding.
  The final frame image of each had a ratio of 1:1, 0.83:1, and 1.7:1 (if I
figured this right); based on the official unchanged media type.  They were 58s
for type 1, 48s for type 2, and 99s for type 3 (ratio is more to the point
though).
  I'll post the small text file of this at p.t.s-f. too so you can see the
setup.

Bob
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Download '3mdalite.mpg' (189 KB)