I'm currently projecting a 120" image onto a blackout cloth screen from an infocus in146 (3d ready 2700 lumen projector) from only about 5ft. This projector uses a dome wide angle lens to produce its ultra short throw and is a table top set up just below eye level. I have total light control, but the walls and ceiling are white (renting). Get plenty of brightness for 2d, but was looking for some gain for 3d. This is more of a make shift movie room than a high end home theater and seating is at the center of the screen.
Checking what screen material would give the optimum gain as I'll be using it for 2d and 3d.