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CRI and R9: What's the deal?

CRI and R9: What's the deal?

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Colour Rendering Index, or CRI, is a term used to describe the measure of how well light sources render the colour of the objects they illuminate. The CRI of a light source is calculated by comparing the appearance of eight reference colours (R1 to R8) under the light source in question with a reference light source (incandescent light or sun light). The smaller the difference between the reference colours when viewed under the two light sources, the higher the R value will be. The first eight R values are then averaged, and the resulting number is the CRI (or Ra) value.

Although still a valuable resource, CRI values do not give an accurate indication of some colours that are predominant in clothing, food, art, and skin tones. A good way to judge the colour quality of a light source is by taking a more saturated colour reference, such as R9 (red), into consideration. The R9 often has a lower value in LED or fluorescent technologies, yet a high R9 value means a much better colour rendering result for the majority of applications.

CRI R9 Round Colour Diagram.jpg

Colour Rendering Index, or CRI, is a term used to describe the measure of how well light sources render the colour of the objects they illuminate. The CRI of a light source is calculated by comparing the appearance of eight reference colours (R1 to R8) under the light source in question with a reference light source (incandescent light or sun light). The smaller the difference between the reference colours when viewed under the two light sources, the higher the R value will be. The first eight R values are then averaged, and the resulting number is the CRI (or Ra) value.

Although still a valuable resource, CRI values do not give an accurate indication of some colours that are predominant in clothing, food, art, and skin tones. A good way to judge the colour quality of a light source is by taking a more saturated colour reference, such as R9 (red), into consideration. The R9 often has a lower value in LED or fluorescent technologies, yet a high R9 value means a much better colour rendering result for the majority of applications.


R value S50 comparison.jpg

 
 
 
 
 
 

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Bright Light LED Lighting Solutions

Bright Light is one of New Zealand’s leading lighting wholesalers. If you’re after an LED lighting solution for your project, we’ll help you implement an excellent lighting result. We stock a wide range of innovative LED lighting products, ranging from high-powered and architectural to ambient and residential, and our experienced technicians are on hand to assist you with any queries that you may have. As a pioneer and leader in the New Zealand LED lighting industry, we have built a solid reputation of innovation, high quality, and reliability.

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