I typically put a nice little display in the front of my house on Halloween night. I drape a small room in front of my door with blacklights, glowing zombies, and motion sensor activated soundeffects. The kids love it! Well now I have an LT150! I was thinking to play a movie on the lawn. I have a small house. with a window facing the front yard. I can leave the projector in the house and project through the window. What kind of material can I use for REAR projection cheaply? Will a cheap white sheet(low thread count) work? Remember, picture quality is not a paramount concern for this application. Also, I have ambient light because of a street light maybe 40 or 50 feet away from the screen location. We'll be leaving the white segment on. If the picture is watchable, I'll be happy.