A DLP lamp is used to power what is seen on a rear-projection television, and is also used in modern color digital projectors. Digital cineman projection also used DLP technology.
A local shop that sells projectors and related equipment should have them in stock. You could call around to save driving. You may also be able to find them for sale online.
It helps your tv see better pictures which a normal lcd tv cant do. But to me these lamps are very pointless and just a waste of money by the way tell your mom i said hi.