• Question: What is the heat of the filament in a in nomal light bulb that is on?

    Asked by Fuzzy Chicken to Hephzi, Imogen, Jen, Jennifer, Tom on 12 Mar 2015.
    • Photo: Thomas Barrett

      Thomas Barrett answered on 12 Mar 2015:

      Incandescent bulbs convert less than 5% of the energy they use into visible light, the rest goes into making heat. I found a picture of a light bulb viewed under a thermal camera and shows it gets pretty darn hot!

      Tungsten filaments radiate mostly infrared radiation at temperatures where they remain solid so they have to be below 3,422 °C ( or 6,191 °F). For a typical incandescent light bulb, the Tungsten filament operates at approximately 2500 °C

    • Photo: Hephzi Tagoe

      Hephzi Tagoe answered on 12 Mar 2015:

      The filament gets as hot as 2500 deg C.

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