We have two thoughts about this "solar powered light bulb" named Lucy, a plastic orb containing a mirror and a photo sensor that keeps it aimed at the sun.
1) Cats are going to love it.
2) It seems like there's a slight chance that you might end up burning a hole in your ceiling.
Overall, though, this is a pretty clever way to avoid using electricity on light during the daytime, and a pretty nice thing to trip over at night.