If I remmember, the AVS site had a long thread going about these 2 projectors. I think the H30 had a bad reputation for blowing bulbs early in thier lifespan. And the 4805 was constantly being put down for it's fan noise. Just a bit of extra info, not sure about the bulb issue but I can tell you that the 4805 noise factor is not that bad, unless you have it right by you. Mine is mounted about 3 feet above my head and I can't even tell when its running.