On Wednesday, 2 October 2013 09:25:37 UTC+1, Tidak Ada wrote:

>  Halogens aren't useful in nixies, because of the working temperature is 
> much to low. 
> It is not for nothing halogen incandescent bulbs use small bulbs of quartz 
> glass to obtain a high temperature of the bulb!
>

My understanding was that the quartz glass is not part of the halogen cycle 
- its only used because the presence of halogens allows the filament to run 
at a higher temperature and the bulb to have a higher pressure thus giving 
a whiter, more intense, light  - because of this and the smaller bulb, a 
higher melting point glass is needed. The fact that quartz glass is used is 
incidental.

Nick

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