terminology:
CCT = Corrected Color Temperature, expressed as Kelvin… eg…4000k, 5000k…
DUV = Tint, it plots the LED Tint in relation to the Neutral reference, aka bbl, Black Body Line
CRI = Color Rendering Index. measures the percent of a given spectrum output. Red Spectrum, aka R9 CRI. On High CRI LEDs, R9 is a positive number, on low CRI LEDs R9 is a negative number.
R9 is a CRI factor, it is not what we see as the Tint
Common usage of the word Tint, often is misapplied to mean CCT…
Daylight White Balance = 5600k
Incandescent White Balance = 2700k
White Balance of the brain is a primary factor affecting how warm or cool an LED “looks”, at the time.
For example
If I have a 3000K 219B, and I wake up in the dark, it does not look orange, nor “too warm”, at that time.
otoh, the same 3000k during the day, when my brain is Daylight White adapted, makes the 3000k look extra orange, and “too warm”.
Because white balance affects comparisons, I try to use a consistent daylight white balance for photos.
but in actual use at night, a 3000k light does not look as orange as it does during the day.
here is an example of three different Tints, CCT, and R9 CRI
the most apparent difference is the Tint, followed by Color Temperature.
The most subtle difference is R9 CRI. The above photo does not show R9 CRI at all. To see R9, the light must be illuminating a Red object…