Infocus Lp540

I wonder if I need to get the LP640, because it has 2200 lumens, or simply stick to the lp540, should I?

It depends what you mean exactly by Bright. If you mean bright enough that you can read a book while watching TV then yes there are plenty bright enough.

Weeder

UPDATE: Flipcan has no idea what he speaks. All three configurations with my eyes open enough light to read and none more than 1000 lumens. I hate when people give inaccurate information. I know its source.

NO

you should get something to make your room dimmer. It is not recommended to set up a projector in a bright room anyway. If you do you should try to reduce the light from any source. Then take a projector with higher lumens.