Hans,
There are two Lutron products which have B&O options and they are Homeworks and Grafik Eye 3000 Series. For either of the Lutron products to work with the Beo4 or Beo5 it MUST be a B&O compatible version, the standard Lutron units will not work with the Beo4 or Beo5.
If you have one of the compatible Luton products, then the Lutron manual includes the instructions for using the Beo4 as below
All Lutron functions use the LIGHT source even when you are not controlling lights.
The Beo5 uses exactly the same codes as the Beo4 and you may wish to review my Beo5 web pages HERE where you can download a Lutron configuration file for the Beo5 if you have the configuration software.