What is the origin of the idiom "light bulb moment" and when to use it?

The idiom "light bulb moment" originates from the concept of a light bulb turning on and producing light when electricity flows through it. This phrase is used to highlight a moment of sudden realization or insight when a person grasps a concept, solves a problem, or understands something that they could not before. It signifies the transition from confusion or ignorance to clarity and understanding.