projector lamp

I have a Optoma HD142x home theater projector that is in need of a new replacement lamp. This is my first time through this process - does anyone have an experience or suggestions? Should I attempt to replace the bare bulb or just go for the whole module? Found some options at this site -...

Is there a way to test my lamp for a good lamp. I have 3 lamps someone told me they work. I do have a problem with my projector. The bulb doesnt light up. It had problems before with no light up. No visual defects on bulb. Is there a way to test them all? They are very expensive If I throw...