To get a halo around a light source, try changing the scattering model.
Isotropic scattering means that all the media which isn't in shadow will
be illuminated by the light, try something more angle dependant, like
Mie murky, which is type 3.
Also, use the fading feature of the light sources to get a better model
of illumination, although it also takes some time to get used to.
A good way to fake this glow around light sources is to put the
light_source at the center of a completely transparent sphere, and give
that sphere a highlight(I have always used specular, you might want to
try phong). Adjust the size and brightness of the highlight to do what
you want.

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