There were two cows in a field. The first cow said "moo" and the second cow said "baaaa." The first cow asked the second cow, "why did you say baaaa?" The second cow said, "I'm learning a foreign language."
That depends on the speed of the change and the mass of the bulb. Or vice versa, of course. It just might be easier to leave the bulb and change the room. It's all relative.