Originally Posted by ltd76gold
I have found no empirical data to date on what the minimum illuminance of the PT-AE8000 is.
My own situation will have the following dimensions.
Projector Throw = 11.5 ft.
Screensize = 96" diag @ 2:35 to 1 ar.
Using Eco mode and all other lumen output reduction protocols, has anyone been able to attain about 18 to 26fl from this unit within the above parameters?
What screen gain was/is present to achieve the requested luminance?
My media room is light controlled. The pt-a8000's automatic aspect ratio (lens memory control) is a key purchase motivator at this price point.
If I have missed it in the 65 pages of threads, please forgive me.
Projector Reviews includes lumens measurements for each of the factory present modes as well as in calibrated "Best" mode. The full review is HERE
. All of the measured lumens were with the projector's zoom set to mid-range and in full (high) lamp mode. Here are the numbers for the factory preset picture modes:
Cinema 1= 643 @ 7053
Cinema 2= 1175 @ 8554
Game= 1245 @ 10199
Normal= 1285 @ 9746
Dynamic= 1898 @ 7757, 1255 lumens with AI off
Rec. 709= 622 @ 6695
D-Cinema= 643 @ 6437
And for 'Best" mode the lumens output was 602.
As I said above these numbers were with the lens at mid-zoom and the zoom setting can make a big difference with this projector. For dynamic mode the following readings were made for minimum, mid and maximum zoom settings:
Zoom out: 2178 (max. zoom for shortest throw distance)
Zoom in: 1312 (min. zoom for longest throw distance)
The same percentage of change would be expected for all of the other picture modes as you zoom between min., mid and max. zoom settings.
You will need to relate these projector lumens output numbers to what foot lamberts you will get off of your 96" diagonal 2.35:1 aspect ratio screen (this is actually a small screen by home theater standards). For this screen size, and if it has a gain of 1.0, you would get a bright 26 ft. lamberts in the calibrated "best" picture mode with the zoom at its mid position , or just slightly more in the Rec. 709 preset mode. With an 11.5 ft. throw distance you are somewhere between mid-zoom and max-zoom so you would be getting higher lumens out of the projector. The min. throw distance for your screen size is about 10 ft. and with a 11.5 ft. throw I would estimate you would be getting perhaps 8% additional lumens output which would produce about 28 ft. Lamberts in 'Best' picture mode with a gain 1.0 screen. For other screen gains just multiply these ft. lamberts values by the screen gain number. Finally, the above lumens and ft. lamberts values are for the projector operated in full (high) lamp mode and operating it in eco (low) lamp mode reduces the light output by approx. 37%. So, for example, the about case of getting 28 ft. lamberts with a gain 1.0 screen in full lamp mode and for you 11.5 ft. throw distance would drop the light level off of the screen to about 17.5 ft. lamberts in eco lamp mode.
.Edited by Ron Jones - 8/25/13 at 6:45am