What is CRI, TLCI, TM30, CQS?

17/10/2020
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CRI

CRI (Color Rendering Index) is a commonly used standard for judging light quality. Taking sunlight as a reference, it can reflect the color reproduction scale of light, and the value range is 0-100. If the measured CRI value is too low, it may cause color deviation seen by the human eye. In the studio lighting industry, CRI≥90 is considered "good".

Honor 300 Zoom CRI

R9

R9 is a relatively important value in CRI, which is a reduction index of "Saturated Red" color. R9 can further define the final quality of the light source. Because some light sources lack red, even if the CRI is above 80, it does not prove that the quality of the light source is very good.

TLCI

Compared with CRI, TLCI(Television Lighting Consistency Index) can more truly evaluate the color performance of the LED light source on the camera. Generally, the higher the TLCI, the better the effect when the camera is shooting programs.

TM-30

TM-30-15 is a new method for evaluating the color rendering ability of light sources published by the Illuminating Engineering Society of North America (IES) in 2015. Compared with CRI's 8 color indicators, TM-30 uses 99 color evaluation samples, which greatly improves accuracy and reliability, and uses the concepts of Rf and Rg to represent the values of fidelity and saturation respectively.

In 2018, IES released a new light source color quality evaluation standard TM-30-18, which adjusted some functions, measurement intervals and calculation scale factors.

Mini Profile 20 TM30

CQS

CQS is the color quality scale, which was developed by NIST researchers. Due to the CRI proposed by the International Commission on Illumination have been some problems with the use of unsaturated colors and a small number of sample colors, CQS uses higher saturation colors and proposes 15 new colors to evaluate the light source. 100 represents the best light source quality, and 0 represents Worst light source quality.