Most Luminaire manufacturers offer data files about their
products for download. We have collected a few links to the
offerings of some of the better known ones.
The date given with each link is the day
we last checked it, as they may change at any time.
This list is by no means complete or even representative.
Some European manufacturers only provide (huge) data plugin files for the Relux/Dialux programs. Those are really Zip archives, which next to a lot of other information also contain the data files in Eulumdat format.
The IESNA has a database of lighting manufacturers in North America. Most of those will probably provide files in IES format.