betpump, it just seems to me a bit overkill to switch on your landing lights during every level change. Do you do your flying in an area with known uncontrolled and untransponderd traffic at FL350?
A glance at my TCAS display will tell me more about the traffic situation than landing lights going on and off all around me during the cruise. And when there really is a conflict, you should follow TCAS anyway, ignoring what you see outside.