Got new lamp for 52inch pansonic TV rear progector but picture very dark

Double check the settings on your TV. Keep in mind that using a dimmer setting will increase the lamp life.

Also make sure that everything is clean inside the TV as well as behind the screen, but only do this if you are comfortable cleaning the TV. I recommend using a vacuum and not compressed air so that you don't blow dust into the lens or other areas. When cleaning fans, do not let the fans spin as this can wear out bearings.