Noted these lights in place where no lights should be as we drive this road (SR 72) quite often during the night after visiting friends in PHX> We began seeing them about 7 miles from Vicksburg road on SR 72. 5 times we saw the lights become bright, each time a bit further west and every time, after about 1-3 mins, they faded...Not abruptly, they dimmed. Hard to tell shape anything other than the lights were clustered and we noted two clusters. They moved west towards the Colorado river and after the fifth time we never saw them again. Have no idea what we saw.