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

[Check Airman]

Originally Posted by Escape Path

Well, in our company we turn them off when retracting flaps and turn them back on when we lower the landing gear.

So we fly most of our approach without lights (and yes it is because of fuel)

Talk about measuring with a micrometer! Landing lights are to see and be seen. It certainly sems like an unusual measure.