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.
None. First, denounce the nearest Democrats as liberal pantywaists who deliberately caused the bulb to blow. Second, announce that the Bush administration has proved that the science of electricity is faulty, so no action ever needs to be taken on global light change. Third, keep the need for a new light bulb strictly secret. Fourth, use the money for new light bulbs as an excuse for another tax cut for Bush's wealthy friends. Fifth, explain that you would never "disassemble" about the need for light, you are way too busy spreading freedom and democracy in the Middle East by eliminating freedom and democracy in the United States.
Three: one to write the light bulb removal program, one to write the light bulb insertion program, and one to act as a light bulb administrator to make sure nobody else tries to change the light bulb at the same time.