The Panasonic PT-MZ670U has a brightness claim of 6,500 lumens. I am happy to say the projector hit its claim! Most projectors fall up to 25% below claim, so when a projector does hit (or beat) its brightness claim, it truly is cause for celebration. That said, the MZ670U measure just over claim, at 6,529 lumens, but it wasn't in the mode that I would have expected. Typically, if a projector has a mode called Dynamic, that is the brightest mode – in the case of this Panasonic, that mode is White Board.
The second brightest mode is DICOM SIM., which, as mentioned, is a mode that one would only use when needing to read high contrast films such as X-Rays, or negatives from a film camera (though I imagine this is a much less common application). DICOM SIM. measured at 6,171 lumens. The next brightest mode is Blackboard, coming in at 5,812 lumens, and then Dynamic, at 5,597 lumens. Standard Mode, the projector's "best mode," in my opinion, for presentations and some video, measured at 4,377. Natural Mode, which, again, becomes Cinema Mode when plugged into a Blu-ray player, came in at 4,233 lumens.