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Hudson Myers
Hudson Myers

What Does High CRI Mean


Extended CRI is the average of the R1 to R15 indices. In particular, it takes certain saturated colors into account, such as deep red and deep blue, that the general CRI (Ra) does not consider. Therefore, it is important to check certain Ri numbers in the extended CRI, such as R9 and R12 which represent two significant colors for film/video and medical lighting. Thus, when talking about the color rendering index, the definition of high CRI varies, and it is better to begin comparisons with the general CRI (Ra) but emphasize specific Ri numbers in Extended CRI (Re).[10]




What Does High CRI Mean



CRI has been challenged because fidelity to reference illuminants such as CCT is not all that measures the quality of illumination.[11] Various CCTs are preferred, and scoring 100 at one CCT does not imply equal illumination quality as scoring 100 at another CCT. The "warmer" light colors , such as a 2700 K incandescent bulb or a 1700 K candlelight, are more easily reproduced than more neutral white lights, such as 4800 K direct sunlight, and thus usually have higher CRI ratings in alternative light sources such as CFL and LED bulbs; "warmer" light (redder) naturally renders colors less accurately. Think of how the world looks at sunset (2000 K) compared to high noon (5600 K).[12]