All of Sirquak's points are very true regarding bulb life. Try to make sure you treat the new bulb well to get it's maximum life.
Now, as far as recourse I have heard from others at AVSForum.com that Optoma may overlook the 90 day warranty in cases like this, especially because you have the H79 (supposedly handpicked bulb/parts). I'm not saying they will, but I have heard stories of others who have complained firmly but politely to Optoma and gotten a replacment. I would try anyways, couldn't hurt. Good luck.
