Question: what is the difference between ansi lumens and lumens

title: Lumen (unit)
text: The light output of 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 . For marketing purposes , the luminous flux of projectors that have been tested according to this procedure may be quoted in `` ANSI lumens '' , to distinguish them 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 . 

Answer: answer: 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. ANSI lumen measurements are in general more accurate than the other measurement techniques used in the projector industry.
answer: 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.   The luminous flux of projectors that have been tested according to this procedure may be quoted in `` ANSI lumens.''  ANSI lumen measurements are in general more accurate than the other measurement techniques used in the projector industry.