It is plenty bright right now... I even keep it on low lamp mode.
Inertia,
here is a link with more info of the screen I mentioned.
In all honesty, there is fear of being TOO bright in certain scenarios with this screen tech.
I just received my PJ mount, and while I won't install it for at least a week (waiting for other things), I really dig that the pipe is easily extendable/retractable. Because the way the HP is "retro-reflective", I can control the brightness to a certain extent simply by extending or retracting the pipe.
I just tried high lamp mode for the first time recently. It was too bright, for now, thought I wish my low lamp was just a tad bit brighter. I'm saying this where the difference between low and high is considerably less than it is with other PJ models/brands. I'm hoping the adjustable pipe gives me that fine tuning of brightness that I desire.
Another way to adjust brightness (specifically reduce) is with the use of ND (natural density) filters. Some PJs can easily accept them, whereas others don't AFAIK. (There might have to be some threaded thing around your lens????). If yours works with that, then there is less fear of going too bright with this sort of tech.
Good luck!