Just a thought guys, it has been 10 years since i'd flown the 320, had an MEL item once. that one of the landing lights was U/S and EXTENDED, MEL stated 1% additional fuel burn, something along those lines
Sorry, my memory is diminishing rather rapidly... what were we talking about?
The two landing lights in the wings are controlled by a three position switch. Retract, Extend and ON. They are retracted by an electric motor. If this motor fails extended they will still work, but the u/s one will be out all the time which causes drag in the cruise.