Prometheans latest dlp short throw projectors prm 45 and prm 45a are compatible with activboard adjustable fixed and mount systems technical information native resolution wxga 1610 1280 x 800 compressed resolution up to 1080i typical colours 1677 million colours aspect ratio fill 43 169 letter box native contrast ratio 21001 brightness normal 3150 ansi lumens 240w brightness eco 2750 ansi lumens 190w throw ratio 052 focal length f286 projection distance 054