Film-Tech Forum ARCHIVE: A matter of HEAT

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Topic: A matter of HEAT

Shaun Flichel
Film Handler

Posts: 42
From: Regina, Sask., Canada
Registered: Sep 2002

posted 10-03-2002 10:35 PM

I would definately double check the Amps rushing through there, call an eletrician in, with an Ammeter. Most Lamphouses I've seen do have an adjustment on the meter to correct the reading. The adjusting screw is either on the front or the back. It is most likely current thats darkening bulb.

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David Rigby
Expert Film Handler

Posts: 134
From: Chorlton, Manchester, UK
Registered: May 2002

posted 10-04-2002 03:52 AM

On the subject of heat filters, are they ever a bad idea? I'm only runnning 1600W Xenon in a CX16 vertical lamphouse. Should I consider a heat filter?

David

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Ken McFall
Jedi Master Film Handler

Posts: 615
From: Haringey, London.
Registered: Apr 2001

posted 10-04-2002 04:38 AM

With 1600w lamps you are fine PROVIDED everything else is lined up correctly with no hot spots. I can't remember if that lamp house has a cold metal mirror or plain silver?

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David Rigby
Expert Film Handler

Posts: 134
From: Chorlton, Manchester, UK
Registered: May 2002

posted 10-04-2002 05:59 AM

I'll have to have a look

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John Pytlak
Film God

Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000

posted 10-04-2002 08:01 AM

The only issue with heat filtration is that it usually tends to make the light slightly more cyan (higher color temperature), since the filters begin "cutting" the IR in the red portion of the spectrum. Since dichroic coatings vary slightly, they also make it difficult to precisely match two projectors for color temperature. But in general, getting rid of IR in the light beam is a good idea, regardless of the power level.

------------------
John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Research Labs, Building 69, Room 7525A
Rochester, New York, 14650-1922 USA
Tel: +1 585 477 5325 Cell: +1 585 781 4036 Fax: +1 585 722 7243
e-mail: john.pytlak@kodak.com
Web site: http://www.kodak.com/go/motion

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Antonio Marcheselli
Phenomenal Film Handler

Posts: 1260
From: Florence, Italy
Registered: Mar 2000

posted 10-05-2002 09:21 AM

John,

Is the heat filter damaged in any way?
--
No

That might account for the drastic
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It is not so drastic! Without the filter I have just a bit more light but a better light temperature.

Is the filter put in the right way (coating towards the lamp?
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I thought that the coating is double side...

A water-cooling assembly is available for V5's
--
We already have it!

Does the lamphouse have it's own fan for exhaust?
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yes

Is it possible that the fan(s) turn off while running a show.
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We'll check!

Are other projectors affected?
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We have just one!

You said;"... the air into the lamphouse has been recently increased.." What did they do? Could someone have done something that causes turbulence?
--
The exaust pipe was too long and the original cinemeccanica fan was not able to pump the air outside. We changed the pipe direction and installed a new, powerful, fan.
As I told you the temperature of the chassis was so high that the plastic part of the projector are melted.

IREM ignitors have a spark-gap device. It's in a round, clear plastic peice that snaps onto the ignitor. Temporally swap it with another to see if the bulb ingites better.
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We have not other projector but we'll try!

Sorry for the total wild-ass guesses, but it's all I can think of.
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Thanks for your help!!

Antonio

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