To the OP, the flickering is a normal condition for any LED based lamp. It is caused by the pulse on the light circuit which is sent by the car to test the system. If your light switch is set to auto, you will see the flicker. If its set to off, you won't see it. You don't see it with the OEM lamps because halogen lamps are not as sensitive to slight changes in voltage and the pulse doesn't trigger a flickering effect for that particular lamp source.
09 E90 M3 - Interlagos Blue / Black Novillo / Sycamore Anthracite / Eibach / HRE