A light bulb is a device that produces light from electricity when turned on. Light bulbs are often used to bring light to a space or to indicate when an electronic device is on.

In many works of fiction, a light bulb is sometimes used to indicate that a character just thought up a bright [[idea]].

h4. See also

* [[marquee lights]]
* [[palm-fist tap]]
* [[spoken light bulb]]
電球 灯泡