One to petition the Ministry of Light for a bulb, 50 to establish the state production quota, 200 militia to force the factory unions to allow production of the bulb, and one to surreptitiously dial an "800" number to order an American light bulb.
Depends. One, if it's an eco-kosher bulb that isn't going to be lit by electricity generated from nuclear power. Two, as long as a man and a woman rabbi have equal turns putting in the bulb. Three, one to change it, one to do a Buddhist mindfulness practice during the change, and one to document the paradigm shift in a best-selling book called The Jew in the Lightbulb. Four, same as above plus an additional rabbi to study the psycho-halachic implications of such a change and then lead a retreat weekend on the experience.