A320 navigation lights, how do you use them, do you alternate between sys 1 and sys 2

[a330pilotcanada]

Good Evening All:

Getting back to the original question it was simple for our operation System 1 was selected for odd numbered flights System 2 for even numbered flights that way bulbs got even use.

Now to the question of extending landing lights again very simple other then the USA (below 18,000 for high performance VFR) lights were out at 10,000. With regards to vibration very little and it sounds like a mountain out of a mole hill as it pays to be visible.....