Quick explanation: In orthodox judaism, one is not supposed to operate a light-switch on the Sabbath.

I'm not jewish, but some of my friends are observant (but progressive) and use the Sabbath as a day of reflection. This seems to completely go against the spirit of the rule (to spend a day living simply with friends and family, without technology for maximum reflection, introspection, and rest).

I don't see how this gadget would catch on -- unless someone is bound is follow the rule to the letter, but doesn't really want to (but then at that point, they should just stop adhering IMHO)