CRI(Color Rendering Index)-Lighting terms and definitions

CRI color Rendering Index

Percentage of color fidelity of an object perceived in natural light versus other light, where natural light sources like the sun have a wonderful index of 100.


What is “CRI Color Rendering Index” in LED lights?

color rendering index (CRI) is a quantitative metric to measure the colors of various objects faithfully in comparison with a natural or standard light source. 

Color rendering, as defined by the International Commission on Illumination (CIE), is the effect of an illuminant on the color appearance of objects in comparison with their color appearance under a reference or standard illuminant.

How does the CRI metric work?

The CRI is typically expressed as a numerical value on a scale from 0 to 100, with higher values indicating better color rendering.

CRI Metric:
● A CRI of 100 represents perfect color rendering, meaning the light source accurately replicates colors in the same way natural daylight does.
● A CRI below 80 is generally considered to have a noticeable impact on color rendering, making colors appear less accurate or less vibrant.

CRI Rating:
Actually, the CRI is calculated based on how closely the colors match their appearance under the reference light source. It is determined by evaluating the color rendering for eight specific sample colors (R1 to R8). A spectrometer checks to see if the light contains adequate quantities of those colors compared to sunlight.

However, this 8-color(R1 to R8) metric can’t tell you comprehensively whether or not a light source can render more saturated colors, so CIE decided to add 6 more saturated colors R9-R14, also referred to as CRI (R96a), while the former 8 colors we called CRI (Ra).

CRI-Color rendering index (R1-R14)TJ2 Lighting, LED Lighting Manufacturer in Taiwan.  led lighting company, led lighting suppliers, led lighting manufacturers, taiwan led lights

Why do we need to measure CRI?

The CRI characteristics for LED lights can vary from product to product or in different production periods or methods. Measuring the Color Rendering Index is important for several reasons:

  1. Color Accuracy: CRI helps assess how accurately a light source renders the colors of objects, especially when compared to natural daylight. In applications where color fidelity is crucial, such as art galleries, retail, fashion, and interior design, accurate color reproduction is essential. CRI measurements ensure that the chosen light source does not distort or misrepresent colors.
  2. Aesthetic Quality: In architectural and interior design, lighting plays a significant role in creating the desired ambiance and aesthetics of a space. Accurate color rendering enhances the visual appeal of a room and the objects within it. CRI measurements help designers choose lighting that complements the intended atmosphere.
  3. Product Presentation: For businesses, the presentation of products is critical. In stores, shops and other retail spaces, for example, accurate color rendering ensures that merchandise appears as it should, which can influence purchasing decisions.
  4. Art and Photography: In art studios, galleries, and photography studios, accurate color rendering is essential for creating, displaying, and photographing artworks. Artists and photographers rely on proper color representation to achieve their artistic goals.
  5. Medical and Health Applications: In hospitals and other healthcare settings, lighting with high CRI is important for accurate assessment of skin tone and examination of patients. It helps doctors and healthcare professionals make accurate diagnoses and assessments.
  6. Consistency and Quality Control: CRI measurements are useful for ensuring consistency in color quality and can be an important tool for quality control in manufacturing processes where color accuracy is vital.

Overall, the measurement of CRI is essential for assessing and ensuring the quality of light sources in various applications, where the accuracy and fidelity of colors play a significant role in aesthetics, functionality, and safety. It provides a standardized way to evaluate the ability of a light source to faithfully reproduce colors, thereby influencing our perception of the world around us and the success of specific tasks and activities.

Before | Other Brands | Low CRI and Lumen

Franz Collection under the lights of other brands.

Before and After comparison of the Franz collection under different light sources-TJ2 Lighting
After | TJ2 Lighting | High CRI and Lumen

Franz Collection under the lights of TJ2 Lighting.

Different color Rendering Index of our LED Lights

RD-LED-DEEP 75 made by TJ2 Lighting-LED Lighting Manufacturer in Taiwan

RD-LED-DEEP Downlights

● CRI(Ra): 90/ 95
● CCT● 2700k ● 3000k
● Deep adjustable LED recessed downlight
● Adjustable 24°
● Die-cast aluminium
● Anti-glare deep reflector

RD-LED-HIDE 95 products made by TJ2 Lighting-LED Lighting Manufacturer in Taiwan

RD-LED-HIDE Downlights

● CRI(Ra): 90/ 95
● CCT● 2700k ● 3000k
● Deep adjustable LED recessed downlight
● Adjustable 24°
● Die-cast aluminium
● Anti-glare deep reflector

CL-Quitus-110 ceiling light made by TJ2 Lighting-LED Lighting Manufacturer in Taiwan, led lighting company, led lighting suppliers, led lighting manufacturers

CL-Quintus 110 | Ceiling Light

● CRI(Ra): 90/ 95
● Deep LED ceiling light
● Anti-glare deep white reflector
● Die-cast aluminium
● Color temperature ● 2700k ● 3000k
● Optical Lens(optional 15°|24°|36°)
● Light fixture formCeiling

TJ2 Lighting | led lighting manufacturer, lighting manufacturer in Taiwan

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