Quoted from DS_Nadine:
It's only one variable and your photos prove nothing.
You won't still see shit in daylight if your projector is not brighter then the sun.
And your screen set up with the windows in the back would appear darker then it is due to the backlighting effect and camera exposure.
You know, like photographing someone with the sun behind him and suddenly hes all black.
You are 100% incorrect.
No matter what the exposure setting is on the camera, it won't hide the fact you're either seeing the White screen or the Projected image... Period.
If you turned the exposure down and snapped a picture of the projected surface on STh LE, you'll still see a white screen with a faint projected image.
Exposure on the camera doesnt add or subtract the white screen material.