AdamB,
I do not know what IES means but I suppose it is a file attached to a component giving all datas for it.
In my case I get the full catalog of Philips, or Thorn and other companies right on a click. Of course, if Lightup had a bridge, all these manufacturors datas could be uploaded in it.
What I wanted to tell was the simplicity and rapidity of that way, and the plus of the lumen diagram (that Light up does not show).