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Over ninety per cent of electricity consumed by glowing tungsten filaments becomes heat. The figure is taken from NIST, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

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Incandescent lightbulbs emit mostly heat rather than visible light

Over ninety per cent of electricity consumed by glowing tungsten filaments becomes heat

Traditional incandescent lightbulbs pass electrical current through a thin tungsten filament until it glows white hot inside a vacuum or inert gas bulb. More than ninety per cent of consumed energy radiates away as infrared heat rather than visible illumination, which led to modern LED bulb adoption.

Lightbulbs photograph — Mark jurrens · CC BY-SA 4.0 · licence · source

Where this comes from

NIST

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Tags: lighting, electricity, energy

Incandescent lightbulbs emit mostly heat rather than visible light: the short answers

Where does this come from, and can I check it?: Over ninety per cent of electricity consumed by glowing tungsten filaments becomes heat. The figure is taken from NIST, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a everyday life fact?: Yes. It sits on the Everyday Life shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.