How bright is too bright ? 50ftlambs=CRT TV ? - AVS Forum
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post #1 of 4 Old 01-12-2002, 08:46 AM - Thread Starter
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Greetings, its good to see some definate designs for Torus screens have come up (thnx don). So the question is, how many foot lamberts is too much ?

If all goes to plan Ill have a XG135 in the next few weeks, and if I ran that with a 80" 2.8 gain torus screen I get 35.39 foot lamberts. If I go with a 4 gain silver torus screen, we hit a sunny 50.55 foot lamberts.

From the XtremeDTV webpage;

Quote:
The 4.0 gain PLATINUM is SUPER BRIGHT and is ideal for high ambient light situations. Very mild color shift can be noticed on it only when using a white field, otherwise, it is phenomenally 3D-like with a dramatic PUNCH to it.
Given that the torus screen deals with the color shift and hotspotting of silver screens, is there any reason not to use a silver screen ? (CINEMAX, you have installed these havn't you ?)

Now Im thinking, that if I have a screen that bright, that it might not be such a panic if a bit of light enters the room ? Will this give me the image quality comparable to my 32" WS TV ?
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post #2 of 4 Old 01-12-2002, 09:06 AM - Thread Starter
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Also, with something that bright, I would think the XG135 could be run at low brightness levels and give the tubes an easy time. Would this drastically improve the spot size ? If people are getting 960 lines out of there 135's under normal circumstances, would this go up much if driven really easily ?
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post #3 of 4 Old 01-12-2002, 09:08 AM
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Most TV's are somewhere 20's on the ft-L.

I would personally aim for the 30's. 50's might be a little high but I wouldn't use a 4.0 gain screen if at all possible.

Also, you projector can typically do better than its ANSI spec for brightness for most video material. A good ball park number for the actual brightness you'll get would be 200% of your ANSI for heavy use or 150% of your ANSI rating if plan to use it more for the long term.

So a 200 lumen projector can easilly do 300 lumens for really long term use or 400 lumens for shorter life span. These ratings are for video material to be used as a guide in making your decision.

Good luck.

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post #4 of 4 Old 01-12-2002, 04:51 PM
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MrWiggles ,
Wouldn't pushing a projector speced for say 200 ANSI to 300-400 ANSI also result in blooming in addition to reduced tube life?
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