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Can any type light bulb be powered by gas?

  1. Jul 27, 2008 #1
    Can a halogen light bulb be powered by gas, or can a halogen light bulb only be powered by electricity?

    Can an incandescent light bulb be powered by gas, or can an incandescent light bulb only be powered by electricity?
     
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  3. Jul 27, 2008 #2

    tiny-tim

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    An incandescent light bulb only needs the filament to be heated, so I suppose you could have a hollow filament with very hot gas passing through the centre and heating it.

    A halogen light bulb is just an incandescent light bulb whose filament is surrounded by a halogen, which lets it get hotter while lengthening its life. :smile:
     
  4. Jul 27, 2008 #3
    Are there (or have there ever been) incandescent light bulbs that were powered by gas and mass-produced?
     
  5. Jul 27, 2008 #4

    russ_watters

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    No. I'm not even really sure what the point would be. The burning gas would give off more light than the filament!

    Judging by your other thread, I'm not sure you understand something here: a gas lamp doesn't have a ligth bulb in it.
     
  6. Jul 27, 2008 #5

    tiny-tim

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    That's why I'm putting it inside the filament! :wink:
     
  7. Jul 27, 2008 #6
    Do you concur with tiny_tim that a gas light is basically just a torch that is powered by gas?


    I've seen gas lights in which the flame is enclosed in a glass box. By definition, does a light enclosed by glass have to have a filament that is lit by incandescence in order to be a light bulb?
     
  8. Jul 27, 2008 #7

    russ_watters

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    Yes, a gas light is just a torch. The flame gives off light. I'm not sure it that is incandescence or not. I think it is - the flame glows because it is hot and contains impurities. Some types of flames give off light via other processes though, so I'm not certain if that's really incandescence or not. We've had that question enough times though, I aught to know by now...
     
  9. Jul 27, 2008 #8

    russ_watters

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    Yeah, missed that part, sorry. That would be interesting - I wonder if its ever been done (it is done for infrared, but I haven't heard of it for visible light).
     
  10. Jul 27, 2008 #9
  11. Jul 27, 2008 #10

    mgb_phys

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    Incandescence is light due to heat - it is an important question because the law in the UK said that you had to have an "incandescent light" which banned LED bike lights.

    It got changed recently when EU car makers started fitting LED lights.
    Until then you could be stopped for having an LED light which both exceeded laser eye safety limits and wasn't considered accepatable illimunation!
     
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