Summary: Personal Experience We standardized on this projector for our campus in the Spring of 2012, this was after I purchased several other makes for testing. The projector rated higher than specified for lumens (effectively 4300 for 4000 lumen projector). We installed 6 foot short throw lenses to increase brightness. Focus, uniformity and registration is also very good. Problems The short throw lens is a little more "sloppy" than I would like..