I agree with Mr. Mitchell that these be falsely represent as OEM lamp from Optoma . I be in the process of try for a refund - the bulb do not even turn on in the projector . the projector be function perfectly when the last bulb finish its predict life . the seller be extremely anxious that I remove my negative comment and repeatedly request they removal . if other dissatisfied individual have remove they negative comment already , a balanced set of review may not even be available and people will continue to get burn . however , the seller do post a full refund -lrb- incl shipping -rrb- back onto my credit card , when I ship the lamp back .