Bit if a follow up for anyone searching for this.
I’ve now used the VR50 lense a few times.
Most of the rides have been dull mixed in with some sunny periods. They’ve been spot on there with me never really noticing the lenses which IMO is a good thing. I certainly never noticed them being too bright or too dull. In dull conditions, I’d equate them to persimmon lenses, in the brighter, something similar to a non-iridium grey lense.
I haven’t done any really sunny rides so can’t comment on whether they go any darker but my in-the-garden test of holding the lenses up to bright sun for a couple of minutes and comparing to my grey lense suggests they’re similar. Compared to black iridium, they’re less dark and compared to blue iridium maybe a fraction darker (though that might just be because the blue iridium is yellowish to look through which tends to brighten things).
And as a final test, I did a night ride with them! They definitely don’t go completely clear but they’re light enough that I had absolutely no trouble with them despite it being proper dark (eg no outside light). I was using a DX 900ish lumen light for reference.
All in all then, very happy.