On Mon, 21 Jun 1999, Jan Steinman wrote:
>>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... :-)
I can't explain it too well. See the tech section on my page, Don
Klipstein's link. "Soft Start" should be there somewhere (on Don's page).
Basically, rapid temp changes are bad for filament life. The 'fan only' is
there and should be used if a bulb blows during a show and you want to
cool it as fast as possible so you can handle it (paper towel or cloth so
you don't transfer oil to surface). HTH,
/Acer Victoria
--
http://student.ucr.edu/~siddim01/
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