Recommended color rendering index CRI base on your project

The CRI, colour rendering index, is a one-number quantification that indicates the performance of an artificial light source in terms of colour rendering compared to a reference standard light source modelled on daylight. The highest number is 100, for daylight and incandescent/halogen lamps, while gas discharge lamps range from 17 to 96, with even a negative value for low sodium pressure (the yellow type used in street lamps).

Due to this variation in the ability to reproduce colour with the white light emitted by the many types of gas lamps on the market, CRI index was introduced in 1974 by the International Commission on Illumination (CIE). 

Today, with more than 40 years of use, the CRI index is firmly rooted in the lighting industry and among professionals. However, it has not been very well understood by the public. The reason was that such knowledge was not really useful as most lamps were built for specific applications that required a minimum CRI value, so one could not go wrong when choosing a lamp.

For example, for office or other linear lighting, the lamps of choice where Tri-Phospor linear fluorescent tubes on the market since the 1970s, all with a CRI value above 80. For domestic lighting, there was a mix between incandescent and halogen lamps, both with CRI100, for retail and other high intensity spot lighting, metal halide lamps with CRI min 85. Street lighting was reserved for high intensity and very efficient sodium vapour lamps, which had a poor CRI but this was considered not important.

From the year 2000 this changed with LED technology, the first light source that can be used for any application while having a broad performance and quality level, including the ability to reproduce colours accurately. It is therefore essential that you choose LEDs with the right CRI level for your application.

CRI comparison

The picture above shows how colors can look different based on the CRI of the light source that illuminates them. A vibrant red under sunlight or a high CRI light can look dull or even orange under a low CRI light.

We recommend to not choose a light source with CRI less than 80, unless this light is used for orientation purpose only, outdoors from streetlights, or inside on corridors or stairwells. 

When possible, you should choose lights with higher CRI than 80, as recommended in the table below: 

Application Minimum CRI value Recommended CRI Value
Residential    
Bedroom 80 90
Living room 80 90
Bathroom 80 95
Kitchen 80 95
Business    
Office, general work 80 80
Office, work with colors 90 97
Design studio 80 97
Commercial    
Electronics store 80 90
Fashion 90 97
Hardware store 80 90
Interior design store 90 98
Jewelry 80 90
Medical    
Dental Clinic 90 97
General Practice 90 97
Hospitality    
Café 80 95
Hotel 80 95
Restaurant 80 95
Other    
Street light 70 80
Transit/parking lot 70 80
Storage room 70 80
Warehouse 70 90
Photography 90 97

 At Lumistrips you can find LED strips and modules with the highest CRI today possible, up to 98+, with technologies such as Nichia Optisolis and Seoul Semiconductor SunLike.

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