Color Quality Scale vs CRI: What Commercial Lighting Buyers Should Know
The color quality scale is becoming more important in today’s lighting industry, especially for commercial buyers seeking more accurate ways to assess lighting performance. While CRI (Color Rendering Index) has long been a popular metric, it often falls short in capturing how modern LED lighting truly behaves.
For lighting professionals, facility managers, and business owners, understanding both CRI and the color quality scale can make a significant difference in lighting selection.
This guide explains how each metric works, compares their strengths and weaknesses, and explores why the color quality scale is gaining attention in modern lighting design.
Why Is Color Quality Important in Commercial Lighting?
Color quality plays a key role in how people perceive a space. Whether it’s a retail store, a restaurant, a healthcare facility, or an art gallery, lighting influences how products look, how people feel, and how effectively a space functions.
For example, in a retail environment, the right lighting can make merchandise look more appealing. In hospitals, lighting helps doctors see skin tones and conditions accurately.
In hospitality settings, lighting helps create a welcoming mood. The color quality scale offers a modern way to evaluate how well lighting supports these experiences.
What Is CRI and Why Has It Been Used So Widely?
The Color Rendering Index (CRI) was introduced in the 1960s by the International Commission on Illumination (CIE). It measures how accurately a light source shows colors in comparison to a reference light like sunlight or an incandescent bulb.
CRI is scored on a scale from 0 to 100, with higher numbers indicating better color accuracy.
CRI looks at how a light performs across eight pastel color samples (R1 to R8). Some manufacturers include additional values like R9, which measures deep red performance, though this is optional.
CRI has been widely used for decades because it provides a simple way to understand how lighting performs. However, as lighting technologies have evolved, especially with the rise of LED, CRI has shown its limitations.
What Are the Limitations of CRI?
CRI does not measure saturated colors well and doesn’t account for how people perceive lighting in environments. It also tends to overrate some light sources that visually distort colors. This has led lighting designers and specifiers to seek more advanced methods.
One major issue with CRI is its lack of sensitivity to saturated and deep colors. For instance, a high CRI score doesn’t always mean a light will render red tones correctly.
That’s why lighting professionals now look at the color quality scale and other metrics like TM-30 for a more complete picture.
What Is the Color Quality Scale (CQS)?
The color quality scale is a metric developed by the National Institute of Standards and Technology (NIST) as an improvement over CRI.
It measures how well a light source renders colors using 15 color samples, including both pastel and saturated colors. Like CRI, the color quality scale uses a 0 to 100 scoring system.
What makes the color quality scale different is that it includes factors such as color fidelity, color preference, and color saturation. This gives a more accurate and human-centered evaluation of lighting performance.
The color quality scale is especially helpful for evaluating LED lighting, which can have complex spectral profiles.
How Does the Color Quality Scale Work?
Unlike CRI, which only evaluates how similar colors appear under test lighting compared to a reference source, the color quality scale includes more diverse samples and reflects how people perceive color differences.
It accounts for visual appeal, which is critical in commercial environments where mood and brand perception matter. CQS also uses improved mathematical models to reduce sensitivity to small measurement errors.
This means the color quality scale provides more consistent and realistic results across different types of lighting.
Where Is the Color Quality Scale Used Today?
Many industries are adopting the color quality scale to evaluate lighting:
1. Retail
Clothing and makeup stores use high-CQS lighting to make colors appear true to life.
2. Healthcare
Hospitals use lighting with a high color quality scale to improve the accuracy of medical observations.
3. Museums
Galleries need accurate lighting to showcase artwork as intended.
4. Broadcasting
Studios use the color quality scale to ensure that lighting looks natural on camera.
These applications show how important the color quality scale is becoming in professional lighting environments.
Comparing CRI and the Color Quality Scale
The Color Rendering Index (CRI) and the Color Quality Scale (CQS) are two different systems used to evaluate the quality of light. CRI was developed by the International Commission on Illumination (CIE), while the CQS was developed by the National Institute of Standards and Technology (NIST).
One of the primary differences lies in the number and type of color samples used. CRI measures color accuracy based on 8 pastel colors, whereas CQS uses 15 samples that include both pastel and saturated colors, offering a broader assessment.
Another distinction is how each system accounts for human perception. CRI does not consider how people perceive color, while CQS incorporates human visual experience into its evaluation, making it more aligned with real-world applications.
In terms of compatibility with LED technology, CRI is limited, whereas CQS offers strong compatibility, reflecting the shift toward modern lighting solutions. Despite both using a score range of 0 to 100, the CQS is regarded as a more modern and adaptable metric.
It better suits the needs of emerging lighting technologies and offers a more realistic reflection of how humans actually see and interpret color.
How to Read Lighting Specifications with CQS in Mind
When looking at a lighting product sheet, here’s what to check:
1. CRI (Ra)
A general measure of color accuracy. Still used, but not enough on its own.
2. R9 Value
Shows red color performance. Look for R9 above 50 or 80, depending on your application.
3. CQS Score
A more complete color rendering measure. Higher scores indicate better performance.
4. TM-30-20
Includes fidelity (Rf) and saturation (Rg) scores, along with color vector graphics.
If a product doesn’t include the color quality scale or R9, you may not have the full picture.
Conclusion
The color quality scale offers a more accurate and human-focused way to evaluate lighting. While the color rendering index (CRI) still provides a basic reference, it often falls short—especially when it comes to the nuanced needs of LED technology.
As the industry shifts toward smarter and more efficient lighting systems, CQS is becoming a crucial factor in commercial lighting decisions.
For commercial lighting buyers, understanding the color quality scale leads to better-informed choices that balance visual appeal with performance. By going beyond CRI and analyzing full-spectrum color data, you can design lighting environments that truly serve your space, brand, and customers.
To find the right lighting solutions for your project, contact Commercial Lighting Industries. As a trusted national lighting supplier, we’re here to help you make informed decisions that deliver long-term value and lasting impact.
FAQs
What is the color quality scale used for?
The color quality scale is used to measure how accurately a light source renders colors, especially in commercial spaces where lighting appearance matters.
How does the color quality scale differ from CRI?
Unlike CRI, which uses only 8 pastel colors, the color quality scale evaluates 15 samples and includes human color perception, making it more suitable for modern LED lighting.
Why is the color quality scale important for LED lighting?
LED lights have complex spectral profiles, and the color quality scale helps reveal how well they render both pastel and saturated colors in real environments.
Is a higher color quality scale score better?
Yes, a higher CQS score means the light source renders colors more accurately and consistently, which is ideal for applications like retail, healthcare, and broadcasting.
Can I use both CRI and the color quality scale together?
Yes, using both metrics can give a fuller picture of lighting performance, especially when combined with other data like R9 and TM-30 scores.