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Discussion Starter · #1 ·
I am getting the InFocus SP8902 projector and it is rated at 1300 lumens high output, and 1100 in cinema mode. I know these ratings will not actually be this bright, but this is what I am using to calculate since the projector hasn't released yet, therefore no actual brightness numbers exist besides specs.


I will be projecting onto a 123" (107" x 60") screen with a 1.0 gain.


I came to about 29 footlamberts at high output and about 25 footlamberts at low output.


The room is on 13'(w) x 15'(d) and the furthest seat will be about 15' away with the closest at 10'. Is this image bright enough?


thanks
 

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Yeah i was going to say sounds a tad too much.


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First off, Infocus usually is pretty close to their rating. BUT, that is best case scenario (short throw, high lamp, iris open). In addition, it assumes a new lamp and lamps dim over time. Depending on how you actually run it, it will most likely be less than the rated number.


The question is...what is your room like? Whether you need that much or not is going to be based a lot on the room and your watching parameters.
 

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Discussion Starter · #6 ·

Quote:
Originally Posted by Jason Turk /forum/post/17053045


First off, Infocus usually is pretty close to their rating. BUT, that is best case scenario (short throw, high lamp, iris open). In addition, it assumes a new lamp and lamps dim over time. Depending on how you actually run it, it will most likely be less than the rated number.


The question is...what is your room like? Whether you need that much or not is going to be based a lot on the room and your watching parameters.

there won't be any crazy parameters as far as watching goes. First row will be 10' back with 3 berkilnes centered width wise in the room, and the rear row is 15' back with 3 berklines.


Room will have no windows and 100% lighting control.
 

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Quote:
Originally Posted by luelf21 /forum/post/17055986


First row will be 10' back with 3 Berklines centered width wise in the room, and the rear row is 15' back with 3 Berklines.

You will not be able to recline the rear row, to do so requires 6.5 ft, not 5 ft.
 

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Discussion Starter · #8 ·

Quote:
Originally Posted by BIGmouthinDC /forum/post/17056003


You will not be able to recline the rear row, to do so requires 6.5 ft, not 5 ft.

They will be arranged to work, if its not at 10 ft, it will just have to be closer than that. I figured with the back row 1' higher than the front that it would help out some with the front row.
 

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Quote:
Originally Posted by luelf21 /forum/post/17057547


I figured with the back row 1' higher than the front that it would help out some with the front row.


Problem, now you have foot to head clearance issues. You can always just slide the front row up a bit but you will discover it is going to end up about 1 1/2 ft. in front of your riser lip.
 

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Quote:
Originally Posted by luelf21 /forum/post/17055986


there won't be any crazy parameters as far as watching goes. First row will be 10' back with 3 berkilnes centered width wise in the room, and the rear row is 15' back with 3 berklines.


Room will have no windows and 100% lighting control.

I would not sweat it then. Remember, that rating is absolute best case. You can easily close down the iris (increase contrast) as to make sure it isn't overly bright.
 
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