lightbulb

lightbulb moment a moment of inspiration.

☞ The allusion is to the turning on of a lightbulb, which provides instant illumination.

2012The Register We've been beavering away on the Rocketry Experimental High Altitude Barosimulator (REHAB) element of our Low Orbit Helium Assisted Navigator (LOHAN) mission, and last week enjoyed a lightbulb moment as to how to create a decent seal between the metal hypobaric chamber and the glass lid.