Specific screen features that prevent ambient light from interfering with projected images. Even in a well-lit room, the image projected on the ALR screen will have solid color saturation and sparkling high contrast. Ambient light includes - but is not limited to - light coming in from Windows, wall/ceiling lamps, lamps, candles, fireplaces, and even reflections from your own video screenLight on light-colored surfaces in the room, none of them will compromise the quality of your projected image. ALR screens come in two basic types: "retro reflective" or "angular reflective." The difference lie in the direction they reflect the image. And retro reflective ALR is the preferred format in high performance home theater applications..syi