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High pressure tungsten incandescent light bulbs?

  1. Apr 15, 2014 #1
    With increased pressure tungsten has a higher melting point. (source below page 30) 45kBar increases melting point from 3422oC to 3700oC.

    http://www.nist.gov/data/PDFfiles/jpcrd55.pdf [Broken]

    An ideal 5800 K black-body, truncated would be 37% efficient.

    http://en.wikipedia.org/wiki/Luminous_efficacy#Examples

    So extrapolating this graph a 300kBar light bulb would be at 5800k and 37% efficient. I know this an extremely high pressure but would this theoretically work?
     
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Apr 15, 2014 #2

    Vanadium 50

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    No, because you'd have to make the bulb out of steel, not glass. A steel light bulb won't work very well.
     
  4. Apr 15, 2014 #3
    Pressure works out to be around 3000kg/mm2. I'm not sure if it's even possible to hold that in...Also I'm not sure if the gas inside would turn to liquid in which case it would certainly conduct the heat much more effectively, which would transfer to the case.
     
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