On Friday, 1 January 2016 13:12:44 UTC, The Natural Philosopher wrote:
On 01/01/16 12:29, Bert Coules wrote:

Most of my house is lit by ceiling-mounted triple spotlights which use
40W R50 bulbs. Recently, three bulbs in the same position in one
particular fitting have blown within a short time of being fitted. One
lasted about thirty minutes, one almost three hours, the third survived
into the next day. I've checked as much of the unit as I could without
wholesale disassembly and found nothing obviously wrong.

All three bulbs came from a DIY shed multi-pack. Though it seems
unlikely, is it possible that there was something faulty about a whole
batch of them?

Very much so. Could be 'European' bulbs designed for a slightly lower
voltage

220v bulbs have a life of about 300hrs ave on 240v, so it's not that.


NT