Good question and I am still on the fence about trying one out. There are some very mixed experiences out there (and here ) ... if you get a nice one it seems to do the job. If there would be a German seller where I could send it back in case I receive a lemon, then I would have already ordered one.
I find the cool white high CRI option on Nichias especially interesting, that is certainly a feature one doesn't get from CREE. The whole reason I buy neutral/warm tints is to get slightly better CRI... but if I could 95-98 get CRI 7000K XP-G/XM-L ... I wouldn't own a single neutral/warm white light.
You would know the difference. An incan is 100 CRI. If you walked through the woods with an incan driven well so that it was closer to white than to yellow and then did the same walk with a white LED you could tell the difference for sure.
There also is no real distinction between using a flashlight for some period of time and being exposed to indoor lighting for hours on end.
You may not notice that there is anything “wrong” with your lower CRI lights unless you compared them to a high CRI at the same time as our eyes adapt/adjust pretty well.
However, I haven’t been interested in any of the higher CRI lights that are only available in the lower color temps as I prefer a neutral or white light.
Is that thing really high CRI? 70 RA doesn't seem so high to me.... also the experiences aren't too promising as far as efficiency is concerned. (scroll to the end)