Amber light flickered into bright position over Paradise Valley, joined by second amber light, faded and returned many times

Amber light flickered into bright position, remaining positioned rigidly over North Scottsdale (Paradise Valley), occasionally flickering out, then returning, and sometimes joined by identical amber light close by at approximately same altitude, neither light moving.   Light faded, then repeatedly returned over twenty minute period.  May have been farther off, perhaps over Phoenix, but from hillside position, appeared between Camelback Mountain and McDowell Mountains, over neighborhood.