Rolf, the system is used to illuminate the sails at night. It is manufactured by Sierra Echo http://www.sierraecho.fr/
http://www.sail-light.com/
The system comprises batten style light bars. It also can illuminate logos created with Light reactive inks.
Pretty cool. You can also do that with fiber optics, I guess it actually uses fiber optics. Don't know for sure.

Talking about customizing Robi's new Blade ? Pretty cool.