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If the vertical angle between the projector->screen and eye->screen is more than about 15 degrees, (this is a number given to me by Da-Lite customer support) you will start to lose the gain benefits of the High-Power surface. Same as in the horizontal direction, but you have about 25 degrees in this case.


So, lets assume eye level is 4ft, and your projector is at 6ft (a 2ft delta). Then as long as the screen is at least ~7.5 feet away, you should be fine.


Andy K.
 

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Andy,


Thanks for that concise info. http://www.avsforum.com/ubb/smile.gif Just what I needed for figuring out the various positionings.


This may seem like a trivial question, but it will probably be the deciding one...is it EVER possible for the Hi-Power to look "WORSE OFF" than using the Matt White under normal circumstances? What I'm getting at is...assumming all things being less than perfect, would I ever be in a situation wishing I had the Matt White back?


Thanks for everyone's help in advance! http://www.avsforum.com/ubb/smile.gif


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Ok, I remember reading a poster mentioning the Hi-Power is not good for ceiling mount...but I don't remember the specifics. What exactly is lost when celing mounting LT150 with a Hi-Power -- contrast, brightness...? http://www.avsforum.com/ubb/frown.gif


I do not have my LT150 on a ceiling mount, but it is on a custom tall rack about 6' off the floor while the audience is sitting on conventional sofas...so...my question is can someone tell me if this will prohibit me from getting the full benefit from the Hi-Power? I would hate to order an Electro Hi-Power, "mount it up", and then find out it was better off that I stayed with the matt white even with a great return policy. I had to have help to just mount the screen the first time around....


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[This message has been edited by Yahoo (edited 07-27-2001).]
 

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From my understanding, the High-Power reflects light back toward the source. You'd theoretically see reduced brightness from a ceiling mount since the light would be bouncing back up.


I can tell you that moving the viewing angle side-to-side, the High-Power definitely "powers down" and starts to look like matte white.


Maybe I'll try simulating a ceiling mount as part of the next round of viewing angle tests I'm doing with the LT150 and various Da-Lite material


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Tom L.
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Quote:
Originally posted by Yahoo:
What I'm getting at is...assumming all things being less than perfect, would I ever be in a situation wishing I had the Matt White back?
I don't think so either. In looking at the various da-lite samples, moving very outside the optimum viewing high-power viewing angle seemed to reduce the high-power to the equivalent of a matte white.


I'll do some more pictures tonight including different angles and will hopefully have them up tomorrow.


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Tom L.
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Ok, those of you that are interested in a Da-Lite screen and in the Los Angeles area might want to jump in on a quasi-powerbuy by saving on the shipping.


I am ordering a high-power 69"x92" electro screen from a local dealer for $740 but I was told if we can buy several Da-Lites (any size/model) together we can save more. Contact me via email if you are interested to jump in on this deal and if you're around this area. http://www.avsforum.com/ubb/smile.gif



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- Quality & Price!

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[This message has been edited by Yahoo (edited 07-27-2001).]
 

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I beg to differ with my esteemed fellow forumites about the High Power. I have one, and while it does give the picture a lot of 'pop' there are tradeoffs.


The biggest is that the added brightness comes at the cost of poorer black levels.


The high gain screen also exacerbates video noises, particularly when watching cable and sport.


I have a separate matte white 16:9 screen mounted underneath my Da Lite High Power. For normal watching I use the High Power, but for critical watching I roll up the screen and use the matte white one.



Cheers


Steve


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What about brightness uniformity? If you're sitting close to a large-ish screen, and you're off-axis, then the pixels on the screen closest to your viewing position are going to to be at a lower angle of reflection than the ones on the opposite side of the screen.


So, if you're sitting to the extreme left of your screen, would you get a situation where the screen starts out bright on the left side and gradually gets dimmer towards the right?
 

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Is that high power screen glass beaded? Also I want to know if the high power looks white when compared to a Dalite matte white wich to me looks grey conpared to a white sheet of paper.

Federico
 

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Quote:
Originally posted by dhanson:
What about brightness uniformity? If you're sitting close to a large-ish screen, and you're off-axis, then the pixels on the screen closest to your viewing position are going to to be at a lower angle of reflection than the ones on the opposite side of the screen.


So, if you're sitting to the extreme left of your screen, would you get a situation where the screen starts out bright on the left side and gradually gets dimmer towards the right?
no - this is what makes the HiPower so neat. NO hotspots or uneven reflections. also, remember that even if you move off-axis, and the image gets dimmer - after a few minutes your eyes adjust & it looks normal again.
 
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