I thought it might be helpful to start a thread for info regarding Lamp Units in general since so many products currently on market require them. Lifespan experinced per user by display manuf/model. Sources for purchase. My display is a Sony KF60XBR800 (commonly known as GWII) Lamp Block: XL-2000U First Lamp Failure at: 16,473 hours. 2 Replacements ordered one each from Sony Style (still backordered)and Projector Lamp Center. PLC had 8 days of glitches on my 2-day air order, finally resolved by overnighting bulb I received yesterday.