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A Diamond Brand lamp is a complete replacement lamp module that is available for most projectors. Unlike other brands of projector lamps, the Diamond brand lamp uses the original Philips bulb in the case. The Philips brand bulb is considered by many to be the highest quality bulb available. Philips has been a pioneer in the technology that has created the compact light modules that make modern multimedia projectors possible. They are in most of the original manufacturers projectors when they are new. So in most cases; you are getting the same exact lamp at a much cheaper cost. The Diamond lamp warranty is also twice as long as most OEM modules at 6 months.