It is not easy to recognize High CRI, as it is mostly related to Red Spectrum output, that is completely absent in Low CRI.
shining a light on the palm of my hand, helps me tell the difference, but it may not help other people who dont care as much as I do about Red Spectrum output
another way to see a difference between low and High CRI, is to shine the light on something made of wood... but again, not all photos of wood are created equal
in any case, here is my attempt to communicate the Visual effect of High CRI
daylight control shot:
the two on the left are low CRI... notice the wood looks green under them, but it is actually Not green:
of course it is only fair to say, that even the 219b color rendering is different than daylight.. No LED equals the spectrum of sunlight.. but High CRI LEDs come closer than Low CRI LEDs...
another example..
top is low cri, bottom is high cri
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not all High CRI leds have the same amount of Red Spectrum output
Even the N219c is no match for an N219b. The 219c is certainly brighter, but its also considerably yellow/greener, as shown by the light in the middle:
The High CRI Zebras dont even come close to an N219b in terms of Red content. Look at the R9 values, the red bar:
Also look at the spectrum, can you see how much less Red the Zebra LED produces?: