I have a dedicated room with dark walls and ceiling. I'm currently using a 100" elite screen. Not sure of the exact model but its just the basic white pull down screen. I was planning on buying a led projector. More specifically the qumi q5 when its released. Its rated for 500 lumens. Would my current screen be asking to much from one of these little projectors? I thought about going hp but not sure how effective it would be with a ceiling mount and our seating arrangement.