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Author Topic: Why ?  (Read 1113 times)

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LFF64

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Why ?
« on: 27 October 2010, 12:13:27 »
Can anyone tell me why lamps/bulbs go black/silvery inside .
Is it over voltage ie excessive temp or maybe a leak allowing air in Any suggestions  :D
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Kevin Wood

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Re: Why ?
« Reply #1 on: 27 October 2010, 12:18:40 »
It's the metal filament gradually evaporating and being deposited on the inside of the glass envelope.

Kevin
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cem_devecioglu

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Re: Why ?
« Reply #2 on: 27 October 2010, 12:35:10 »
Quote
It's the metal filament gradually evaporating and being deposited on the inside of the glass envelope.

Kevin

 :y
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LFF64

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Re: Why ?
« Reply #3 on: 27 October 2010, 13:11:57 »
Thanks Kevin
But what causes this  :question
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Mr Skrunts

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Re: Why ?
« Reply #4 on: 27 October 2010, 13:16:12 »
Quote
Thanks Kevin
But what causes this  :question

Old age, sounds like us when we go grey.   :-/
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maria

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Re: Why ?
« Reply #5 on: 27 October 2010, 13:32:23 »
Quote
Quote
Thanks Kevin
But what causes this  :question

Old age, sounds like us when we go grey.   :-/
[/highlight]

You've gone grey skrunts ;D ;D
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Sixstring

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Re: Why ?
« Reply #6 on: 27 October 2010, 13:35:39 »
Or BALD...................................... :'( :'( :'(





(or like me, BOTH.)








Some things are meant to be bald, my head isn't one of them!!
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Re: Why ?
« Reply #7 on: 27 October 2010, 18:05:04 »
Its age/usage...
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maria

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Re: Why ?
« Reply #8 on: 27 October 2010, 18:06:22 »
Quote
Or BALD...................................... :'( :'( :'(





(or like me, BOTH.)





Some things are meant to be bald, my head isn't one of them!!
[/highlight]


Your not wrong there......


 :-X :-X :-X ;D ;D


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MaxV6

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Re: Why ?
« Reply #9 on: 27 October 2010, 18:18:16 »
a little more on why.....    based on theory, not sad enough to have done much experimental observation....


evaporation of the element materials...

when you heat something so it's that hot, some of the material is evaporated....   heat is basically highly agitated molecular movement, the hotter something gets, the eaiser it is for molecules to escape , whether it's a solid or a liquid,  so,  slowly, but surely, material leaves the element,   and since the coolest thing in the bulb is the glass, it condenses on the glass, leaving a fine slivery deposit...

when a filament fails , it would seem a lot more does it at once, i'd surmise that as the filament breaks , so the arcing that happens as it begins to separate, vaporises  fair bit more material quite rapidly,   so the sudden "plating" of the inside of the glass.


of course, if any of this is wildly inaccurate i'd be happy to be corrected.....


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tidla

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Re: Why ?
« Reply #10 on: 27 October 2010, 18:39:13 »
just put a new one in and find something else to do ;D
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