Lumenlab: How hot can the fresnels get? - Lumenlab

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How hot can the fresnels get?

#1 User is offline   harb 

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Posted 28 February 2006 - 04:29 PM

I have read many post saying that you need to keep you LCD<=95 degree F. What is the dangerous temp for melting fresnels?
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#2 User is offline   Durachko 

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Posted 28 February 2006 - 04:42 PM

I think the fresnels are acrylic? (PMMA or polymethylmethacrylate) That material has a melting point of just over 100C or ~200F. In short, if you keep your LCD happy your fresnels should be okay too. Hope that helps.

Edit: Not sure if they're acrylic but they're definitely going to be more thermally robust than the LCD.

This post has been edited by Durachko: 28 February 2006 - 04:44 PM

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#3 User is offline   Litherish 

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Posted 01 March 2006 - 01:48 AM

Yeah, they are acrylic.

Usually problems with the fresnels come with them warping after long times of exposure to the heat. But it can be prevented by having a solid frame to mount the fresnels in.
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#4 User is offline   Durachko 

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Posted 01 March 2006 - 02:37 PM

View PostLitherish, on Feb 28 2006, 08:48 PM, said:

Usually problems with the fresnels come with them warping after long times of exposure to the heat. But it can be prevented by having a solid frame to mount the fresnels in.
As I very recently saw a post about someone having a bowed front fresnel I feel compelled to point out that by "solid frame" Litherish - I believe - means the frame itself must be rigid and resistant to bending; however, the fresnels must still be allowed to move within the frame due to thermal expansion they will undergo during projector use. :)
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