These little lights solved our "dark front entry" problem perfectly! The need both darkness AND motion to be activated and one provides sufficient light (to see) to unlock the front door without being too bright or harsh. They are easy to install (you tube installation video available) and easily detach from the base, for battery replacement, similar to a smoke detector. We have two front doors, one exterior and one inside a sun porch so both lights have been put to good use. I was fortunate to get these lights at a sale price and have already ordered a second set... for a dark room in the basement that only has one ceiling fixture with a string on it; very tricky to find that string in the dark!
November 29, 2013 UPDATE: Unfortunately, this 'perfect solution' was short-lived. We started to notice these lights going on when there was neither motion or darkness (after several months). While some lasted (worked properly) longer than others, eventually they all became non-functional. So, after all, NOT the solution we were hoping for. In a nutshell, not worth the money.