just have to order my first replacement bulb for the 8100 , get 1750 hour out of it and have have no other issue whatsoever . as I be check for replacement bulb on Amazon I think I would check on the review for this projector and be surprise to find out about all the problem people have , especially with the bulb . I buy the unit in November of 09 -lrb- previously own a Panasonic -rrb- and have use it almost daily since then . set up be in the basement , good airflow , room temperature year round at about 68 degree . I clean the filter monthly , have not touch the fan yet , run in ECO mode at all time . under these condition I have have zero issue with the unit , and even though I actually feel that 1750 hour be a bit low -lrb- I get 2500 hour on the Panasonic -rrb- , see the complaint on here I guess I can count myself lucky . I would also mention that no one can ever seriously expect the hour on a lamp that a manufacturer estimate , 4000 hour be practically impossible to achieve , but I do expect around 2500 hour or so . have say that , I be overall extremely happy with the product and be wait for the replacement bulb to arrive soon . if any other issue arise , I will update .