Your both repeating and misconstruing the info you saw on PC. Lets get it straight for you.
The Throw distance on the Left, that is a "Centered" figure. Should you instead choose, or have to out of hand place the PJ closer, then your PJ's lumen output will be used to greater effect. If you place the PJ at 9' - 9" you would get 39 fls reflected light off a 1.0 gain screen. At 11' 4", that drops to 34 fls...and at 13' - 11" it drops to 30 fls. So "Closer" means brighter.
Use brightness to your advantage whenever possible. Lamps dim with age....and PJs always calibrate better and produce their deepest Blacks when the Lamp is on "Economy" (Low) They last significantly longer too.
Now let's go back and look at that 15" figure on the right, where the line denoting 15" that goes over to the Bottom of the Screen shows to be above the center of the Lens. That Sir, means the PJ has a "Lens Offset"
of 15". And that means wherever the center of the Lens is when the PJ is mounted "inverted"....then the top of the Image will 15" BELOW
Say you mounted the PJ so the Lens was 15" down from the Ceiling. Add in the offset and the Top of the Image would be a full 30" down from the Ceiling.
Now unless you have 12' high ceilings, that isn't gonna work. Even a 9' ceiling would spell trouble.
So instead, you need to mount the Pro8200 as "High" to the Ceiling as possible.
Let's use 6" 6" + 15" = 21" from the center of the Lens to the Ceiling. The Top of the Screen's image will be 21" down from the Ceiling.
- You have a 8' ceiling.
- 96" minus 21" equals 75".
- Your 92" Screen's image is 45" high
- 75" minus 45" = 30"
..........The bottom edge of your Screen's image will be 30" off the Floor.
As your Ceiling height rises....9' - 10' - 12' ...........then the Len's offset becomes less an issue, and you can drop the PJ further down from the Ceiling as desired (...and practical....)
Chief RPA -O Universal or RPA -PJ Dedicated. Ultra low profile. Like Iron embedded in Stone, the Chief is among the sturdiest, most easily adjusted, and resistant to loosening of all Mounts.
You will need one...along with a Peerless ACC570 Ceiling Plate and a 2" Threaded Steel Nipple (8' Ceiling) or a 6" length....or 12", the variables can suit the circumstances and needs, but always, that 15" Lens Offset must be factored in.
So there is your best start....we caught a big issue before it became one.