Brendan Moran wrote:

> I am having a similar problem at work at the moment, though the bulb life
> has another factor that is not present in this discussion.  The situation
> is that the light bulbs are having very short life spans.  Like 2
> weeks.  They are the lighting for a shielding room for a permanent magnet
> MRI.  Thus there is a very large magnetic field on them all the time, so
> that when a current is passed through them, a force is created that
> alternates direction 120 times a second.  In other words, being in that
> room, causes the filaments to shake themselves apart.  When I was asked
> about the problem, my answer to them was to rectify to DC, but no steps
> have been taken on that count, so I'm not certain that it will make a very
> big difference.

The easiest way to fix this is to switch to 12v bulbs,
with large filaments etc. Preferably automotive bulbs
which are better suited for vibration than the trendy
12v lights for home use.
-Roman

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