Not 100% apples-to-apples, but probably close enough to be helpful...
I've got the 130" wide Seymour AV fixed screen (2.35) with an RS20, but no lens (ie., zooming). Dedicated room with full light control.
The front of my projector is 15.375' from the screen.
I'm currently getting ~14fL on the screen. The iris is wide open and I'm at 148 hours on the bulb, so that's going to drop over time.
It's plenty bright for me right now, even when watching football games where I've got some ambient light going in the room.