Modern household bulbs range from 40 to 200 watts — the Centennial bulb now gives off 4 watts, about as strong as a night light. Thought to have been a 30-watt bulb when installed, the Livermore light seems to have decreased in power over time.
https://www.mercurynews.com/2011/02/03/tests-shine-light-on-the-secret-of-the-livermore-light-bulb/
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