Buying context
How to Choose the Right Projector Screen Size
Projector screen size is more sensitive to room conditions than TV size. Throw distance, wall width, seating distance, projector brightness, and light control all affect whether a larger screen actually looks better.
A 100-inch screen is the safest starting point, 120 inches is the common home-theater target, and 150 inches needs a larger room with stronger brightness and better light control.