Tom: I bet I can make you say purple.
Joe: How?
Tom: What colors are in the American flag?
Joe: Red, white and blue.
Tom: I told you I can make you say red.
Joe: You said purple!
Tom: I told you I could make you say purple!
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.