lumen is the measurement of how bright a specific point is, so in reference to the brightness of a projector, this will refer to the brightest part of the projected image.
ANSI lumens is the...
ANSI is the American National Standards Institute. They coordinate the development of US Voluntary National Standards in private and public sectors with regards to information management and data...
ANSI = American National Standards Institute
ASME - American Society of Mechanical Engineers
ANSI is mainly a standards-keeping institution. ASME issues standards, but has other activities also...