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The polarizers may not work as expected because of the LCD chips in the projector. I think each color has different polarization, so they may not dim up and down evenly.
also, the high temperatures at which halogens operate are designed to sustain the reaction between the gas in the lamp and the filament. Reducing the temperature slightly may cause the filament boil-off to go on unabated - and actually shorten the life of the bulb.
Marc Taylor
Coordinator, Andrus Planetarium
Hudson River Museum
511 Warburton Avenue
Yonkers, NY 10701
914 963 4550 x223
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-----Original Message-----
From: Harry White [mailto:[log in to unmask]]
Sent: Tuesday, November 02, 2004 12:03 PM
To: [log in to unmask]
Subject: Re: Using Data Projectors in Starlab
ISEN-ASTC-L is a service of the Association of Science-Technology Centers
Incorporated, a worldwide network of science museums and related institutions.
*****************************************************************************
Thanks for this David.
At the moment we use a neutral density filter as a quick fix, but I wanted
the increased bulb life too.
I'm probably going to hack one apart soon but I just hoped for the
reassurance that someone else had gone in there first.
Thanks again,
--
Harry White, Concept Development Director
Techniquest, Stuart Street, Cardiff, UK. CF10 5BW
Tel: +44 (0) 29 20 475 475, Direct: +44 (0) 29 20 475 464
Fax: +44 (0) 29 20 482 517
Web: http://www.techniquest.org
Techniquest is a Company Limited by Guarantee,
registered in England and Wales, no. 1955696
It is a registered as a charity, no. 517722
> From: David Taylor <[log in to unmask]>
> Reply-To: Informal Science Education Network
> <[log in to unmask]>
> Date: Tue, 2 Nov 2004 08:58:36 -0700
> To: [log in to unmask]
> Subject: Re: Using Data Projectors in Starlab
>
> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> Incorporated, a worldwide network of science museums and related institutions.
> *****************************************************************************
>
> Harry,
>
> What about putting 2 sheets of polarizer material over the lens
> and gradually turning them until you get the amount of light
> transmission you want?
>
> Dave Taylor
>
>
>> From: Harry White <[log in to unmask]>
>> Date: Tue, 2 Nov 2004 16:41:09 +0000
>> To: <[log in to unmask]>
>> Subject: Using Data Projectors in Starlab
>> *********************************************************************
>>
>> Does anyone out there use data projectors in their Starlabs ?
>>
>> If so, have you investigated de-rating the bulb at all ?
>>
>> The projectors are far too bright to go happily with the starfield projector
>> and reducing the current should greatly increase the bulb life.
>>
>> I havenšt tried it yet and I suspect some clever electronics will shut the
>> projector down as soon as the current falls.
>>
>> Has anybody out there tried it ?
>>
>> Thanks
>> --
>> Harry White, Concept Development Director
>> Techniquest, Stuart Street, Cardiff, UK. CF10 5BW
>
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More information about the Informal Science Education Network and the
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