What does make the GT720 stand out, is the brightness. With this projector capable of over 2000 lumens, it's got twice the punch of what we consider a typical home theater projector. That's a good amount of brightness for your favorite family room, bedroom, or wall somewhere.
Here's what the back of our room looked like for the higher ambient light shots: Shutters were mostly open. The ceiling you see, is a very flat, very dark blue, and still reflects a lot of daylight. In addition, the side wall window's shutters (closest to the screen) were also partially open, as shown below. So, with all the back windows letting in a lot of light to the rear of the room, plus a little from that side window, and as you can see below, there's still a very watchable overexposed image, although it is definitely taking a hit to the contrast and blacks. Immediately below that, is a second shot of the same coach, just an exposure to match the image, which makes the rest of the room look really dark, but more closely resembles what the picture actually looked like to view.