ISTJ: One, but only if s/he’s a certified electrician with a credible work record. In other cases it won’t happen, because that’s way out of line.
ESTJ: The ISTJ electrician will fix it. If there is none, the ESTJ will do it him/herself while mumbling “Why don’t we have a certified electrician with a credible work record for this?”
ESFJ: 3-5 of them, and they will do it together or take turns during the process.
ISFJ: One will be adequate, if someone justs asks him/her nicely.
ISTP: One, but not before passing under it several times without fixing it, and not before checking the breaker a few times as well.
ESTP: One ESTP, but two light bulbs. One will break in the process.
ISFP: Lights a candle instead. It’s more romantic, and the flickering candle casts very expressive shadows, as opposed to that sterile light bulb.
ESFP: Removes every piece of clothing from the body and covers her/himself in glow-in-the-dark paint. Then throws a “Light bulb’s broken” glow stick rave party.
INTP: Theoretically, it would only take one. Practically, however, it won’t happen.
ENTP: Will shrewdly invite someone over for a movie evening or something. At some point during the evening they’ll ask their visitor to do it, while they do something else that’s also important.
INTJ: One. “If you want something done right, you’ve got to do it yourself. Damn idiots can’t even change a light bulb correctly…”
ENTJ: The ENTJ goes online to find the most efficient low energy bulb available. Then s/he delegates the actual buying and changing to an independent contractor. Probably an ISTP.
ENFP: A pack of them. Together they go to the lamp store to pick out a new, cooler bulb. The one they come home with is probably red or ultraviolet.
INFP: The INFP becomes sad, after concluding that the light left because it didn’t like him/her. Eventually, they’ll buy and install a new bulb, but they’ll keep the old one in a box in the closet for the rest of their lives for nostalgic reasons.
INFJ: “… It’s a sign of the coming darkness.”
ENFJ: As many as possible. None is to be left behind.