projectors (including video projectors) is typically measured in
lumens. A standardized procedure for testing projectors has been
established by the
American National Standards Institute, which involves averaging
together several measurements taken at different positions.[1]
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.[2]
This allows projectors to be more easily compared on the basis of their
brightness specifications.
