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G9 Bulb Replacement Qs
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Dennis@home
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G9 Bulb Replacement Qs
On 14/04/2019 23:21,
wrote:
On Sunday, 14 April 2019 19:46:03 UTC+1, TheChief wrote:
Thanks Jeff
I suspect you are right about the heat issue.
Although the fitting is as-supplied, the glass shades are
horizontal 38mm I/dia
around 50mm long.
Also, being in the hall they have foot traffic regularly above.
So maybe vibration also plays a part.
Phil
The hotter the filament is, the weaker it is, so reducing voltage slightly can help resist vibration to a [to me] unknown extent.
NT
But also reduces the temp of the quartz envelope so the halides have
less effect and cause blackening of the bulb.
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