Unreliable Basta lighting system

I bought a new bike with the Basta Ellipsoid front and the Basta Ray Steady rear. Both according to the manufacturer Z-diode as surge protection.
One day, after about 5 rides with light the headlight turned out the backlight (LED Zener diode alleged lifetime 100.000) went up initially but ended up being about 4 km drive also defective. Supposedly yes the taillight has a Z-diode against over-voltage, but that seems to be more a rumor than a fact. I guess almost, that is the product description wrong or an inferior part is installed with me. I am very angry and understand positive test evaluation to the product.

Genuine Parts is not available for the rear light. Although the products of Basta relative are favorable, so I am very unhappy, especially as it was very dangerous for me to drive at night without any light through the area at high risk for me and other road users.
Tragic that a Aufall of a lamp in a lighting system Basta shoots everything completely ....

Greeting

Christian