Now that’s a big light bulb…
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The Big Bulb…
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Article by Daniel Meyer
Author. Adventurer. Electrician.
That’s a Mogul bulb. I’ve never seen one in a ceiling fixture, but they were common in floor lamps at one time. I still have one, vintage 1920. You can buy the bulbs from specialty dealers, but they’re expensive and short-lived. If you have a lamp with a Mogul socket, buy an adaptor.