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What features should a light bulb filament material have?

April 26, 2017features Filament light bulb material

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What features should a light bulb filament material have?

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Using Planks law and Wiens law you can predict the wavelength and intensity of light emitted by a filament at different operating temperatures. Since, only light visible to the eye is useful, the greater the fraction of visible light emitted by the filament, the more efficient it will be. The largest fraction of visible light is emitted from a filament operating at ~5,000 K. More light is emitted at higher temperatures, but more of it is out of the range of visible light. Inventors have used these principles to invent and improve incandescent filaments. Now take a short quiz on the essential features a filament material should have.