If it is that dark I would not worry about it at all. I have the Pearl on a 104" screen in a non light controled room and it is more than bright enough. Actually has a window and a sliding glass door and with all lights on daytime HD football is extremely bright in high lamp mode. I watch movies with shades and at night so it is very dark in low lamp mode and I would have no problem going that big in a total controled room. If the RS1 is any more than the Pearl than you will be just fine. MY .02
Nate
Nate