Diamond Lamp For CHRISTIE LW400 LX400 LWU420 Projectors Diamond Lamps has a unique set of agreements to buy directly from the four leading original lamp manufacturers: Philips, Osram, Ushio and Phoenix. These companies are able to produce lamps to the necessary performance, reliability and longevity standards required by all the projector brands. Between them they hold many patents for the lamp technologies involved. Diamond lamps are assembled into very high quality cages made precisely to fit correctly into the relevant projectors, simply and safely. All Diamond Lamp modules are tested with the projectors before they are released for sale.