Hitachi cp ex251n projector technical specification resolution xga 1024 x 768 white light output brightness 2700 ansi lumens normal mode 2214 ansi lumens eco1 mode 1809 ansi lumens eco2 mode colour light output colour brightness 2700 ansi lumens normal mode 2214 ansi lumens eco1 mode 1809 ansi lumens eco2 mode contrast ratio 20001 lens manual focus manual zoom x 12 lamp wattage 225w lamp life 5000 hours normal mode 8000 hours eco mode 1 10 000 hours e