8mm Forum: causes of a blown lamp

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Topic: causes of a blown lamp

Tassos Laudas
Expert Film Handler

Posts: 102
From: Viersen Germany
Registered: Mar 2006

posted March 03, 2007 05:21 AM

Hi to all, i'd really appreciate knowing your opinion about which could be the cause of projector lamps getting easily blown, taking for granted that the voltage setting as well as the lamp itself are the correct ones!

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Kevin Faulkner
Film God

Posts: 4071
From: Essex UK
Registered: Jun 2003

posted March 03, 2007 05:26 AM

You dont say what machine the lamp is in but from my experience lamps going brown is very often caused by lack of air flow across the lamp when the machine is running.

The lamps with integral dichroic mirrors also tend to show blistering of the coating round the base of the lamp again due to lack of air flow.

Some machines are more prone to this than others due to their design.

Kev.

--------------------
GS1200 Xenon with Elmo 1.0...great combo along with a 16-CL Xenon for that super bright white light.

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Osi Osgood
Film God

Posts: 10204
From: Mountian Home, ID.
Registered: Jul 2005

posted March 03, 2007 02:42 PM

I have an intersting lamp story. I was recently trying to put a new lamp in and it wasn't fitting well on plug-in,

(I'll call it that),

I had it half on, and it wasn't going on the rest of the way, so I attempted to take it off and try again. The
actual "hood" of the lamp,

(I'll call it a hood)

CAME OFF, completely. I was mortified. These things aren't cheap! I thought, what the hell, i pushed the bottom half of the lamp all the way on, and then fitted the "hood" back on.

It works fine! It hasn't worn out yet and I've had it on for at least 20 hours now.

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"All these moments will be lost in time, just like ... tears, in the rain. "

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Tassos Laudas
Expert Film Handler

Posts: 102
From: Viersen Germany
Registered: Mar 2006

posted March 03, 2007 02:58 PM

Osi when those things happen you leave them as they are as long as they work. Kevin i am refering to a Bauer t510 super 8 projector, and i was just curious wether this could have something to do with a worn tranformer. The lamp won't last more than 8 hours of projection...

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Joerg Niggemann
Expert Film Handler

Posts: 127
From: Germany
Registered: May 2006

posted March 03, 2007 05:13 PM

Did you measure the lamp voltage? 5% increased voltage means 50% decreased life of your lamp...

I had a similar problem with a Bauer machine. Although the mains voltage setting was ok, the lamp voltage was too high.

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Kevin Faulkner
Film God

Posts: 4071
From: Essex UK
Registered: Jun 2003

posted March 03, 2007 06:29 PM

Yes I would agree with that too. Have you checked the voltage at the lamp when it is on. I too suspect the voltage is possibly a little too high.

What is the voltage in your country and did it come from a country with a lower voltage. If we get a machine from Europe it will be set for 220V and if that is not changed and run on our voltage of 240v here in the UK the lamp life is really short.

Kev.

Kev.

--------------------
GS1200 Xenon with Elmo 1.0...great combo along with a 16-CL Xenon for that super bright white light.

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