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Re: [OM] slide projector handling OT now

Subject: Re: [OM] slide projector handling OT now
From: Wayne Shumaker <shumaker@xxxxxxxxxxxxxxx>
Date: Wed, 23 Jun 1999 13:23:21 -0400
Previously I said:
>What usually burns out a bulb is the surge of current when you first
>turn it on, not the change in temperature. The resistance is much
>lower when the filament is cold than when it is hot, hence it pulls
>more current when you first turn it on. 

So, another thought. If you turn the light off and the fan off, the
lamp will remain hotter, so that if you turn it back on it will not
suffer from the lower resistance/higher current. So I would propose:

1) Do not use fan when you turn the lamp out IF you plan on turning it
   back on shortly, keeps the lamp filament hotter. This is offten the
   case when people change trays, etc.

2) Use the fan on with lamp off to cool it down as much as possible
   before moving the projector to storage.

Wayne


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