The reason I ask was a flaring presence when playing movies with my new Optoma HD23 projector. I heard some users complaining that this projector might be too bright for rooms other than typical man cave with dark walls. I wanted to dim flaring by using low gain screen (0.8) which would also reduce amount of reflected light from the screen that would bounce off the walls back to the screen. Using high gain screen in my case would be a mistake if Optoma is just too bright for my environment.
So I made an experiment today running my old Infocus projector (750 lumens / 1:2000 contrast comparing to Optoma 2500 lumens / 1:5000) on same screen same room and found flaring is gone with picture becoming darker but more color vibrant and natural looking without washout. This made me thinking that my new Optoma HD23 is indeed too bright for typical 500 sq.ft. living room with beige walls and drapers, while ceiling and dark floor (I watch in complete darkness). I used same screen and result was stunning. The old projector (with replaced 117 hrs only lamp) far much dimmer creates black level I desire, while my new Optoma not only lights up dark scenes filling black areas with “grey” that cannot be controlled. Of course my old Infocus is a history so I look forward to test dimmer Hd33 tomorrow.
One other thing that I wonder is the projector position. Currently I have no option to mount it on the ceiling and Optoma sits on the stand leveld with bottom edge of the projeciton screen so the light angle is directed up which makes me believe that I am getting increased amount of light reflected off the screen toward my white ceiling comparing to projector mounted under the ceiling where light beam is directed on bottom angle. One way or the other I am positive about my Projecta screen I have which is absolutely uniformed, and allows me to watch movie form any angle including super sharp angles, it is pretty amazing actually. Still, subject problem remains unresolved. Hopefully this will change tomorrow.