Here is what I've managed to find so far:
- Osram Opto (factory in Regensburg)
- Optogan with facility in Dortmund, Germany. Next year they'll start LED manufacturing in Russia.
- Tridonic (Austria)
- Vossloh-Schwabe Optoelectronic GmbH & Co. -- Factory is located in Kamp-Lintfort, Germany.
Do you know other companies manufacturing high brightness LED in Europe? Please post in comments.