I have less than 100 hour on this new bulb , so I can not comment on bulb life . my largest quibble be with the bulb 's location on the projector in that I have to take it down from the ceiling and remove the mount to replace the bulb . also , there be no installation instruction include , so I have to find the owner manual . and these bulb be still too expensive . but the picture from the revitalize hd70 make it all worth while .