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CRI 90 VS CRI 80 VS CRI 70 Led strip light

Views: 0     Author: Jessica Liu     Publish Time: 2021-07-13      Origin: https://www.suntechleds.com


Recently,One of our customers asked us to customize CRI>90 Strips. When he received the sample, he compared our CRI>80 band with CRI>90 band, and then he changed his mind and chose CRI>80 band.

Do you know what is the reason? And what is the relationship between CRI and Lumen? Will CRI>90 be more suitable for LED strip applications? Now we are sharing our basic knowledge of LED strips with you.


What is CRI?

    CRI is the color rendering index, also known as RA. It is the degree to which the light color of an object is reduced. It can also be said to be compared with the sunlight at noon. The higher the CRI, the closer the color is to sunlight. In other words, the objects we see under the light are more real. CRI is an important parameter in the development of led lighting. The highest CRI is 100 and the lowest is 0. In the beginning, the CRI of the LED was very low. No more than 60, LED CRI now ranges from 70,80 to 90.


For the cost, the higher the CRI, the higher the price. For most applications, CRI>80 is sufficient. For some very high requirements, we can use CRI>90 and CRI>95. Now more and more projects use CRI> 80 LED strip lights. Suntech provides LED strips with CRI>80 and CRI>90.

CRI and color temperature

First, let me introduce what is color temperature for you,Color temperature is a description of the warmth or coolness of a light source and expressed in Kelvin. When a piece of metal (often mysteriously called a blackbody radiator) is heated, the color of the light it emits changes. The color starts out red, then slowly turns orange , yellow, white, then bluish-white to a deeper blue. But it's important to note that higher Kelvin temperatures are cool, while lower temperatures are warm, the opposite of what's in an oven. Cool light is preferred for visual tasks because it produces higher contrast. Warm light is preferred for living spaces because it suits skin tones better.

Color tempreture

CRI is independent of color temperature. These are two different things. For example, a 5000K (daylight color temperature) fluorescent light source might have a CRI of 75, but another 5000K fluorescent light source might have a CRI of 90.

CRI and luminous flux

The color rendering index of sunlight is 100, but as a characteristic of the light source, the illuminating light determines the degree of restoration of the object's color. The color rendering index of sunlight is 100, but as an LED light source, the CRI of the lighting lamp determines the degree of color reduction of the object.

We all know that the three primary colors are red, green, and blue light, and red and green are mixed to get yellow. So blue light and yellow light mix to form white light. The mainstream of the LED base is that white light is made of a mixture of blue chip solution and yellow phosphor, so the LED spectrum is mainly blue and yellow.

However, due to the spectral characteristics, the green and red components are relatively small, so the color rendering index of the LED is generally less than 100, generally between 70-80.In order to improve the color rendering index of the LED, red or green phosphors are added to the LED, but due to the low excitation efficiency of the red and green phosphors, the color rendering index of the LED is increased. Pink or green phosphors are added. Later, but the overall lumen has been reduced a lot.

led light spectrogram

In mainstream industries, the higher the LED color rendering index, the lower the luminous flux. At present, in the LED industry, while increasing the luminous flux, there is no better way to increase the color rendering index.

How to calculate the CRI LED

1. The color temperature of the relevant light source must be determined first. Spectral measurements can calculate it.

2. The color temperature of the light source must be determined so that we can choose the appropriate daylight spectrum for comparison.

3. The light source in question will then virtually shine onto a series of virtual color samples called Test Color Samples (TCS) and measure the reflected color.

There are 15 swatches in total:


We will also prepare a series of virtual reflected color measurements for natural daylight at the same color temperature.

Finally, we compare the reflected colors and choose the "R" score for each color swatch.

How is CRI measured

The R value of a specific color indicates the ability of the light source to faithfully render that specific color.

Therefore, in order to characterize the overall color rendering capability of a light source across various colors, the CRI formula takes the average of the R values.

Which CRI LED to choose ?

From this we draw a conclusion:the higher the color rendering index, the lower the brightness. If you need to buy high-performance light strips, it is best to choose a lower color rendering index, such as CRI>70 or CRi>80. If you don't need high-efficiency light strips, you can chooselight strips with a color rendering index> 90. 

Suntechled provides both high-efficiency light strips and regularly led strips for your choice, click here to know the difference between high-efficiency light strips and high-efficiency led strips, also, you can contact sales2@suntechleds.com for more product information.

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Further Questions:

    1. Is a LED CRI of 80 good?

Compared to CRI90, CRI 80 may not be able to represent the original color of the object better, but it is usually sufficient for projects without color rendering requirements, and it is brighter than CRI90

2. What is the CRI of daylight?

The color tempreture of daylight is betwwen 6000K-6500K, CRI is none of business with color temperature. For example, a 4000K LED lamp could have a CRI of 70, but another 4000K LED lamp can have a CRI of 90.

3. Are high CRI led strips worth it?

The higher the CRI, the better realistic the object colors. Usually, a CRI80 is considered good, while CRI90 or above is thought of as excellent.

4. Difference between lumens and CRI?

LUMI represents the brightness of the object, the higher the CRI, the lower the lumens(brightness).

5. What does CRI 95 mean?

95 CRI means excellent / professional color quality.

6. What is the CRI score?

The index of CRI is measured in the range of 0-100 where 100 represents the perfect illumination of the object under the light source.

Some confusing concepts:

    1.CRI vs TLCI

TLCI, a standard recommended by the European Broadcasting Union (EBU). Used to evaluate the quality of color rendering of telecine lighting. A value from 0 to 100 is used to represent the degree of color reproduction of the light source in the TV lighting environment. The higher the value, the higher the degree of restoration and the better the color rendering effect. The test of the TLCI standard is somewhat similar to the CRI, and is determined by a color comparison icon to display the comparison results.

2.CRI vs RA

Technically, Ra is just a symbol in the general CRI calculation formula, but has been widely used as a synonym for general CRI.

3.CRI vs Correlated Color temperature(CCT/Kelvin)

CRI represents the degree to which light restores the color of an object; Correlated color temperature indicates whether a color gives a person the temperature of being cold or warm,it is measures in degrees Kelvin.

The CCT tells us the color of the light emitted by the bulb, immediately visible to a casual observer looking directly at the light source. On the other hand, the CRI value doesn't tell us the color of the light itself.

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