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Jeff Layman[_2_]

On 14/04/19 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.

Weren't filament bulbs in trains and buses underrun to help prolong
their life? Also, I think that the term "robust" for their construction
is hardly sufficient for the bulbs used in Tube trains - the movement
and vibration in the carriages was quite remarkable at times.

--

Jeff