I have both of these TV's, well just ordered the KF-42WE610. I thank everyone for their help and finally decided on it and ordered it from GoodGuys.com. Anyway, I know with time the lamp goes out on both TV's. I can't seem to find which lamp the 50XBR800 requires but from what I read the KF-42WE610 requires a XL-2100U. Where can I purchase these lamps and will this by chance work on both TV's so I can just keep one on hand for both? Thanks.