The story
From Thomas Edison, inventor of the light bulb, due to the appearance of the light bulb, filament, and light produced, mimicking the appearance of bulbs produced during Edison's era.
Etymology from Wiktionary, CC BY-SA 4.0.
Edison bulb
Today it means: a type of lightbulb that mimics the appearance of bulbs and filaments and light produced by early light bulbs of Edison General Electric during the introductory period of electric lighting Full definition →