The concern is rapid of cooling of the bulb adversely affecting filament
life. On my aging Kodak Carousel, I've always used "fan only" to cool the
bulb after use. Failing to do that drastically shortened bulb life in my
experience. However, my experience was back in the 1970's, and I haven't
changed my projector or my practices since those days. I have changed the
bulb every few hundred hours or so. The whole issue probably akin to the
question of warming up an automobile engine by idling prior to loading it by
driving off. Some advocate one side, some advocate the other. I've got over
500,000 miles on my two diesel VW's, both of which I bought new. I generally
try to let them warm up by idling before driving off, unless there's an
urgent need to get under way at once....
Nick Smoliga
SvT TF12 - Investment Projects
1103 Avenue B
Arnold AFB, TN 37389-1400
> -----Original Message-----
> From: Jan Steinman [SMTP:jans@xxxxxxxxxxx]
> Sent: Monday, June 21, 1999 12:03 PM
> To: olympus@xxxxxxxxxxxxxxx
> Subject: [OM] slide projector handling
>
> >From: Acer Victoria <siddim01@xxxxxxxxxxxxxxx>
> >
> >On Sun, 20 Jun 1999, Keith (R.K.) Berry wrote:
> >
> >>There are a couple of tips newcomers to slide projectors may not know:
> ...
> >And if there is a "fan only" setting, it SHOULD NOT BE USED, unless it is
> >to cool a blown lamp so can change it and proceed with the show.
>
> Why? I've always left the fan on for a few minutes after using a
> projector.
> It doesn't seem to have hurt bulb life, but I haven't exactly been keeping
> good records... :-)
>
> : Jan Steinman <mailto:jans@xxxxxxxxxxx>
> : 19280 Rydman Court, West Linn, OR 97068-1331 USA
> : +1.503.635.3229
>
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