Off topic but noticed that you have your location as Basel City. I will be on a Rhine river cruise later this month starting in Basel after spending a few days in and around Zurich. I am sure you will get some assistance from someone on the forum regarding your lighting question. Off the top of my head I wonder if the bulb is a double filament bulb and it could be as simple as replacing it with a single filament. Of course that may have the opposite effect of what you are after and only run the running lights. I am still slowing learning about the NC.