To be blunt, it's not a straight changeover going from halo to media, it can
take a lot of adjustment and still might not be exactly reproduced.
The following might be about what you had before, I couldn't check since
this PC doesn't have POV-Ray 3.0 on it.  Looks about like what you might
have intended.

Bob H.

sphere {
    < 0, 1, 0>, 2
    pigment {
        color rgbt < 1, 1, 1, 1>
    }
    interior {
     media {
        intervals 5 samples 10, 20
        emission <2,1,1> // color adjust here or use scattering {}
         density {
        spherical
        turbulence 1.5
           density_map {
            [ 0.0 rgb < 0.01, 0, 0> ] // less fades
            [ 1.0 rgb < 1, 1, 0> ] // more is denser
         } // density_map
         } // density
     } // media
     } // interior
    hollow
}

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