8mm Forum: Lamp Care

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Topic: Lamp Care

Timothy Duncan
Expert Film Handler

Posts: 150
From: Russellville, KY, USA
Registered: Sep 2014

posted October 24, 2014 06:05 PM

Mr. Duncan has chosen to delete his post.

[ February 01, 2015, 11:48 AM: Message edited by: Douglas Meltzer ]

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Dominique De Bast
Film God

Posts: 4486
From: Brussels, Belgium
Registered: Jun 2013

posted October 25, 2014 01:08 AM

I turn the bulb off as soon as the film ends. On some projectors the fan keeps on runing all the time, but on most it runs only when the central knob is on the forward or rewind position. Some projectors have a preheating system, other don't. I would say there is no reason to keep the bulb on when rewindind, it heats it unnecessarily. I don't know why your bulb burnt but it is more than probably not because you turned it off (as it is intended to be light on and off). A very important thing to remember is never to move the projector (or the bulb) when the bulb is hot as Athis moment the filament is more fragile.

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Dominique

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Terry Sills
Phenomenal Film Handler

Posts: 1423
From: Weymouth,Dorset,England
Registered: Oct 2012

posted October 25, 2014 01:40 AM

Dominique is right. Lamps have a limited/finite life so it is always best to switch it off when not in use to maximise it's life. The motor and fan will be running while you are rewinding which will cool the lamp, but as Dom says, do not move or jolt the projector while the lamp is on or cooling down. It is not a good idea to keep switching the lamp on and off as the initial power-up causes the most stress to the filaments. This is most relevant to the old incandescent lamps. The more modern projectors use Halogen lamps which are more resilient and quite often have a pre-heat system which reduces the initial power surge.

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