I still use an old 1991 crt projector (3 lamps). I bought this in very used condition in june 1999. At the time the projector needed some big tuneups to get rid of it's linearity and blurry pictures problems, so that's why i paid only 500$ for it. Anyway it seem to be on it's last miles for a 1991 model. My question is how come the three lamps that i perfectly re-aligned in 1999 are still working like a charm today in february 2005. What are the life expectancy of these kind of projector's lamps ? even with 4000 hours, suppose an average of 2 hours use per day since that time, that gives us the 4000 hours in about 5.5 years so that's allright since june 1999, but remember that this projector is in heavy use since 1991. Of course, i'm very happy with this, but is it unusual ? Thank you.