What is CRI R9 and why is it important?
CRI R9 is one of the color test patterns (TCS) used in calculating the extended CRI. However, many manufacturers list only the overall CRI, which does not include the CRI R9. Therefore, CRI R9 is often a useful additional indicator for evaluating a light source's color rendering ability, especially for objects whose reflectance spectra contain red wavelengths.
A closer look at how R9 is calculated, along with the appropriate color test pattern (TCS9), is a general recommendation for anyone who needs to know about the color quality of a light source.
21.12.2022