Hello, I just purchased a Panasonic short throw projector with 5500 lumen output. Intent is to hang from pipes around 25' from cyc and project backgrounds. I just received it and only had a matte dark gray wall to test on, but the brightness seemed nowhere near enough to fight ambient stage light. However, it seems like many people are successfully using projectors with even lower outputs. Am I being fooled by the dark gray wall? Is this really enough power for the application in general?