Opel Omega A Xenonkit Retrofit Flakes in the Light

Hello dear community have given me from Ebay a Xenon kit with 4300 Kelvin, so that it is not extremely bright or that it does not blind other people. Now I wanted to install those with my Omega, see as it flickers. Some say that I need a relay again others say resistance. What do I really need to fix the problem or is the ECU/burner defective??? Thank you and greeting