I have a 50" Sony WEGA LCD HDTV (KDF-50E2000) I've had it for a little over a year, and I use it for EVERYTHING. PC use, XBOX, Movies, and of coarse watching TV. The picture is still fine, but I just wonder what the life expectancy of the lamp is. What is the typical life use before having to replace. Furthermore, how much will it cost to have it replaced? Furthermore yet, is it something I would be able to do or should I have it done?