Abbreviations of the American National Standards Institute, the institute that sets standards of measure. To measure the amount of brilliance that creates a video using the lumen. For marketing purposes, the luminous flux of projectors that have been tested according to this procedure may be quoted in "ANSI lumens", to distinguish devices that have been so tested from those tested by other methods. ANSI lumen measurements are in general more accurate than the other measurement techniques used in the projector industry. This allows projectors to be more easily compared on the basis of their brightness specifications.

The following are some general recommendations for high definition projectors:

• For a screen size of 92" you would want a projector with a minimum rating of 900 lumens for areas with complete light control, 1000 lumens for areas with some ambient light and 2000 lumens for areas of bright light such as daytime watching in rooms with windows.
• For a screen size of 120" you would want a minimum rating of 1200 lumens for complete light control, 1300 for areas with some ambient light, and 2500 for rooms with a lot of ambient light.

If you are looking for a projector for business presentations, the ANSI lumens rate is vitally important because the detail of the image is not as critical, but the ability to see the image with ambient light is critical.