This unit was in my Mitsubishi Project Television when the TV went bad.  This bulb still worked. I purchased the bulb a few months earlier.   I do not know how much life is left on it but generally they last a couple of years.  I would expect, but not sure, that it would last another year or maybe two.  NOT SURE THOUGH.  Buyer has to take his/her chances. Perhaps as a back up unit also just in case of a failure on your current bulb for a quick fix. There are no markings, parts number or anything.