@filippo
If it works the way with the ies, then just create a very, very tiny
three sided polygon - create a dummy and assign a "look at" controller
to the poly to look at the dummy. This way it's pretty easy to control
the direction of the lightsource. Hope this will help you!
edit: @suvakas ... if you read this, it would be nice to have the
possibility to use a pointlight with Web distribution and the IES file, to
get exported as a very, very small meshlight that uses the IES file of
the pointlight. I don't know how much work this would be, but it would
be awesome for sure! ;o))
take care
psor