I have a pair of home depot Coach lamps by my front doors, worked well for almost 5 years, but my front door face's east.
Well they did work well, until my roommate had the new Boyfriend pressure wash the house while I was at work.... He Pressured washed one of them and it no longer works, but the other one is still going strong.
If your client is having alot of problems I would go along with the remote photo-sensor on the north side of the house. or possibly a timer.
