What is an original lamp

A genuine projector lamp consists of the original bulb and original housing. 
It is the same projector lamp as the lamp inside a brand-new projector. 
The original equipment manufacturer (OEM) assembles and produces the whole lamp. 
such as Philips, Osram, Ushio, Phoenix, Epson, and Panasonic. 
These lamps are designed for optimum performance with their patented technology.