I used to be a rotorwing student in a USfamous training school last year, I was surprised that my instructor taught me that not to use the landing light when taxing or approaching at the night time since the bright would damage the eyes and affected other aircrafts, the landing light is for the emergency device. Is that right? As far as I understand, it should be turn the landing light on at the night time since my fixed-wing instructor told me that.