-first, download the last ctrl.lightprofile beta (from the first post)
-second, download a consistent IES repository
-third, download a great profile viewer
once you unpacked the ies profiles into a folder then
double click the profile viewer application, it does not
require installation. from the intuitive interface navigate
to the profiles folders. once selected a folder you can
view the profiles in a thumbnail style to choose the one
you prefer. great thing is that you can just ctrl+C and
the apz will copy the full path to the profile ready to
be pasted into the ctrl.lightprofile in xsi. if you've not
already a lightprofile shader in the scene, do this: put
a geometryshader in the view, load ctrl.lprofile. paste
the profile you inspected in the profileviewer, then select
a point light to attach it. have fun.
(remember that until you tweak the 'profile' section you
have to 'empty.cache.when.renderregion.closes' from the
preferences->rendering to see your profiles being updated.
once you are sure about your profile you can tweak and
animate the light parameters as always).
on the left the scene with always the same setup
on the right the profile used.