NEC NP-PA500X LCD 3D Ready 5000 lumen Advanced Professional Installation ProjectorThe NEC NP PA500X Professional Installation Projector is one of NEC's stackable projectors. No, you don't stack them on top of each other. You can place up to four of them side by side in a row to project one luminously bright and perfectly aligned image. With four NP PA500Xs that's an image. That's an incredible 20,000 Lumens bright. It's ideal for larger sized screens. The NP PA500X can project a 500" (12,700mm) image or where there is a great deal