Recommended CRI index levels for various lighting projects

Recommeded CRI index levels for various lighting projects (residential, commercial, business, medical)

In the nuanced world of lighting design, the quality of light transcends mere brightness. It encompasses how accurately colors are rendered under artificial illumination—a factor quantified by the Color Rendering Index (CRI). This guide delves into the intricacies of CRI, its significance across various settings, and considerations for selecting lighting that faithfully reproduces the hues of our environment.

CRI comparison

The Significance of CRI in Various Environments

High CRI lighting is pivotal in settings where accurate color perception is essential:

Retail Spaces: Accurate color rendering enhances the visual appeal of products, influencing purchasing decisions.

Art Galleries and Museums: Preserving the integrity of artwork colors is paramount, necessitating lighting with a CRI of 98 or above. 

CRI98 comparison

  • Residential Settings: High CRI lighting contributes to a comfortable and visually pleasing home environment.

  • Healthcare Facilities: Precise color differentiation can be critical for diagnostics and treatment.

In locations where natural daylight varies significantly across seasons, incorporating high CRI lighting can maintain consistent color perception indoors, enhancing both aesthetics and functionality.

Recommended CRI for various applications

When choosing lighting, consider the following CRI guidelines based on application:

  • Residential applications: LED lights with a CRI of at least 90 are recommended for bedrooms, living rooms, bathrooms, and kitchens

  • Business applications: lights with a CRI of 90 are suitable for general work in offices, while lights with a CRI of 97 are recommended for offices where work with colors is involved, as well as design studios and photography studios

  • Commercial applications: LED lights with a CRI of 90 or higher are recommended for electronics stores, hardware stores, and jewelry stores, while lights with a CRI of 98 are ideal for interior design stores.

  • Specialty applications: LED lights with a CRI of 90 are recommended for medical applications such as dental clinics and general practices, while LEDs with a CRI of 99 are ideal for hospitals. For hospitality applications, LED lights with a CRI of 95 are suitable for cafés, hotels, and restaurants.

  • Streetlights, transit/parking lots, storage rooms, warehouses: a minimum CRI value of 70 or 80 is recommended.

 

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 90
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

 

The international lighting standard JIS Z 9112:2019 also classifies LED based on the minimum CRI as shown below.

Minimum CRI Values for LEDs

The minimum CRI required for each class is specified as follows:

  • Standard type is mainly for outdoor use
  • Class 1 CRI LED (Ra80) is for offices and residences
  • Class 2 CRI LED (Ra9085) is for stores, inspection, and medical use, as well as in offices and residences, especially in situations where communication is important; Class 3 CRI LED (Ra95) is for museums and art galleries
  • Class 4 CRI LED (Ra9585) is for color inspection, painting, dyeing, and printing. 

The Color Rendering Index is a crucial consideration in lighting design, influencing how we perceive our surroundings and interact with them. By understanding CRI and its implications, individuals and professionals can make informed decisions to create environments that are both functional and visually harmonious.

Nichia White LED Technology: Revolutionizing Lighting

Nichia, the world’s largest LED manufacturer, has developed an innovative series of LEDs with CRI from 70 to 99 that feature special lighting technologies, designed to revolutionize many lighting applications. At our manufacturing center in Germany, equipped with advanced production systems, we manufacture LED strips  & Modules with these lighting technologies.

Nichia Optisolis CRI99

The highest quality of light by closely mimicking the natural spectrum of sunlight.

Nichia H6 CRI90 LEDs

 Unique red narrowband phosphor technology for industry's highest joint-boost in color quality and efficacy.

Nichia Vitasolis Energetic White Light

LEDs focused on enhancing human mind-body activation, with natural white color enriched with blue-green energy.

Nichia Hortisolis LEDs White LED for Horticulture

 Provide the optimum wavelengths needed for optimal plant growth.

Nichia Dynasolis

Focused on regulating circadian rhythms.

Residential plant growth with Hortisolis LEDs

Replicates the warm, amber glow of High-Pressure Sodium lamps.