Sorry if this is a recurrent question, but I can't seem to get the search function fired up this morning. I purchased a Z2 last November and have been absolutely thrilled with it. I'm trying to decide when to buy a replacement lamp for it so that I have it here when the original lamp goes bad. I know from posting in this area before that bulb life varies, but can someone give me an average figure in terms of hours? I haven't noticed any change in picture quality since I bought it, and it is in use pretty frequently - pretty much on a daily basis. Any help would be appreciated....thanks!