Guys - Attached is a zip with 3 custom HDR gamma curves to play with. These are are designed specifically for users with less than 100 nits.
The curve marked "dark" is the least aggressive and the most natural HDR shaped curve. This should give you a very pleasing look, while being perhaps a little on the dim side. As such the amount of crush and color de-saturation is minimized, tho still present (the curves with no crush and no de-saturation are too dark in low nit setups IMO).
The curve marked "medium" is a little more aggressive than dark, giving a pleasing amount of brightness while increasing crush and de-saturation by a reasonable amount. What I mean by "reasonable" is that it is still acceptable to me and worth the tradeoff in some nice extra pop and brightness over the "dark" curve.
The curve marked "bright" is even more aggressive than medium. But as would be expected it crushes more and some highlights such as in clouds of bright reflective surface may show some blooming (some of this may also be seen in "medium", but not as much). In return for this you get even more pop and brightness.
Note that the terms here medium, dark and bright are RELATIVE to each other. Meaning that all three curves would likely be considered overly bright for setups over 100 nits. IOW within this grouping of custom curves, one is dark, medium and bright compared to the others - but overall they are all generally considered to be quite bright. Certainly there is even brighter still possible, but given that the bright curve is starting to push the tolerance of my limits I don't see any reason to experiment with brighter curves. I think this is as bright as I can go.
Overall I think all 3 curves can offer a great viewing experience for those with less than 100 nits available, for both 1000 and 4000 nit titles. Note that you should check your brightness to make sure bars 81 and up flash and bars 77 and lower do not. Depending on your setup these curves may not work for you in that sense.
I am still watching various content to try them out but generally am quite happy with all three. Overall my favorite so far is the medium one - which as would be expected is a good compromise between the other two. To show off some real pop you can go with the bright. And for a brighter movie that you want to be as true to the source as possible, try the dark version.
Again, remember these curves are intended only for folks with less than 100 nit setups (tho users a little above 100 may still find them pleasing).
If you try these please let me know how it goes and how you like it!
Special thanks to
for having great patience and teaching me to fish!
Edit: 3/29/17 - I am quite happy with these curves, to the point where I have stopped experimenting and just enjoying using the projector again, particularly with 4K HDR titles. I have mostly been using the medium curve, almost exclusively. I have updated the zip file to include the raw .conf files so that others can make curves using mine as a baseline, or to be able to tweak their bbi and bbo parameters to keep the same curves as I have but get the black level right for their pj. To use these conf files, place them in the same directory as the Arve Tool installation. Run the tool, then enter "lf bright" or "lf medium" or "lf dark" depending on which curve you want to work with. Then enter ga to go to the gamma adjust menu. Then tweak from there, do a Pw to write it to the projector and so a "s filename" to save your changes to your own conf file for later tweaking. Enjoy!