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Switch to Deutsch site Stay on English site Skip to main content Search shopping_basket Basket 0 account_circle Log in Menu Search * Subscriptions Back * All Subscriptions * Subscriptions * DesignSpark Subscriptions * Compare our plans * Subscription Management * Subscription Account * Subscription Support * Subscription FAQs * Quotes * Software Back * All Software * PCB Software * DesignSpark PCB Software Overview * How to Download DesignSpark PCB * Learn DesignSpark PCB * DesignSpark PCB Support FAQs * DesignSpark PCB Forum * DesignSpark PCB Articles * Mechanical Software * DesignSpark Mechanical Software Overview * How to Download DesignSpark Mechanical * Learn DesignSpark Mechanical * DesignSpark Mechanical Support FAQs * DesignSpark Mechanical Forum * DesignSpark Mechanical Articles * Circuit Simulator * DesignSpark Circuit Simulator Overview * Learn DesignSpark Circuit Simulator * DesignSpark Circuit Simulator Support FAQs * DesignSpark Circuit Simulator Forum * DesignSpark Circuit Simulator Articles * Software Store * RS Software Store * SOLIDWORKS Electrical * DraftSight 2D CAD * Community Back * All Community * Contribute Content * Login to Contribute Content * Community Content * All Technologies * Create + Engineer Magazine * Student Content * Also in the News * Forums * Software Forums * Community Forums * Activist Engineering Forums * OKDO Rock Forums * News & Events * News * Events * New Products * Competitions * Podcasts * Sustainable Engineering Back * All Sustainable Engineering * Activist Engineering * Our Vision * Sustainability Roundtable * Engineering for a better world * Air Quality Project * Interactive Air Quality Map Part 2 * Mindful Droid Part 2 * Good Air Canary * Breathe Better Bear * Smart Glacier * Skills & Learning Back * All Skills & Learning * Learning * Learn DesignSpark PCB * Learn DesignSpark Mechanical * Learn DesignSpark Circuit Simulator * Grass Roots Education * Career Opportunities * Services & Resources Back * All Services & Resources * Product Data Resources * Product Design Centre * Electronics Design Resources * SnapMagic Parts Finder * Samacsys Part Finder * Ultra Librarian Parts Finder * Reference Designs * Mechanical Design Resources * Traceparts 3D Parts Library * Services * 3D Printing Services * PCB Services * Design Services * Support Centre Back * All Support Centre * Subscription Support * Subscription Management * DesignSpark Explorer FAQs * DesignSpark Creator FAQs * DesignSpark Engineer FAQs * Software Support * DesignSpark PCB FAQs * DesignSpark Mechanical FAQs * DesignSpark Circuit Simulator Support FAQs * Software Forums * DesignSpark PCB Forum * DesignSpark Mechanical Forum * DesignSpark Circuit Simulator Forum * DesignSpark Electrical Forum * Website Support * Website FAQs * Home * Community * Community Content * All Technologies * LED Lighting * What is CRI (Colour Rendering Index)? WHAT IS CRI (COLOUR RENDERING INDEX)? star_borderFollow article ILS 11 Jan 2024 0star_border 0question_answer 0thumb_up YOUR NEXT ARTICLE WHAT ARE LUMENS AND WHY DO WE USE THEM TO MEASURE LED LIGHTS? By ILS Dave from DesignSpark HOW DO YOU FEEL ABOUT THIS ARTICLE? HELP US TO PROVIDE BETTER CONTENT FOR YOU. Dave from DesignSpark THANK YOU! YOUR FEEDBACK HAS BEEN RECEIVED. Dave from DesignSpark THERE WAS A PROBLEM SUBMITTING YOUR FEEDBACK, PLEASE TRY AGAIN LATER. Colour rendering index (CRI) is one method of measuring the distinctive attributes of a light source. It has been around since 1937 and is often misunderstood as a metric of light colour output quality. When really it is an indicator of how well an artificial typically white light source accurately renders and reproduces the colours of illuminated objects, in comparison to natural sunlight. A white LED (Light Emitting Diodes) source with a high CRI rating will render accurate and vibrant colour tones across the full spectrum. HOW CRI IS MEASURED Measured from 0-100, CRI is a convenient and easy metric to interpret as it is represented in one number. A perfect rating of 100 would mean that when under an artificial light source, an object’s colour would still appear the same as it would if under natural sunlight. Typically, any rating between 0 and 70 would be considered as poor. Whilst any ratings above 90 are considered particularly good for colour rendering. Defining and testing for LED light source CRI rating is a more complicated process which involves specialised machinery to test the light source on multiple colour swatches (termed R1 through to R15). HOW CRI IS PERCEIVED CRI cannot be perceived by simply looking at the light source alone. The quality of the CRI will only become evident when the light is viewed illuminating various objects and colours. Although natural light appears white to the human eye, multiple colours are contained within it. The light received from the sun consists of a full spectrum of wavelengths. When viewing an object, the colour perceived is determined by the colours of light that it reflects from the source illuminating it. So, when using artificial lighting it is important to understand how the content of the light can affect how colours subsequently are seen. Under white LED light sources, the reproduced colour of an object may appear quite similar, or quite different. Such light sources attempt to replicate the spectrum of natural daylight so that objects appear as they do under natural daylight. It is this similarity that CRI defines. WHAT APPLICATIONS REQUIRE A GOOD CRI RATING? The lighting application in question will determine how important CRI is. For many indoor lighting applications, a CRI of around 80 will be acceptable. Whereas other applications which are more dependent on light quality and colour will require a higher CRI. For example, in medical, residential, and educational applications, as well as retail stores, galleries and other photography-based applications, colour rendering is vital to provide accurate colour rendering and vibrant aesthetics. A CRI 90 or above light source will ensure colours appear as crisp and bright as they should, accurately rendered. Even in more relaxed settings, high CRI LED lighting can still be pleasant and beneficial. Within homes, high CRI lighting can create a natural and comfortable light that enhances and highlights design detail and colour within. Although, it is worth acknowledging that CRI is only one measurement for light quality. There are other key factors to consider such as lux and uniformity which are also accurate indicators of light quality and brightness. WHAT ARE THE PRODUCTS? ILS OSLON Square Uniform PowerStars ILS OSCONIQ C2424 PowerStars WANT TO CONTINUE READING ARTICLES FROM DESIGNSPARK? Become a member to get unlimited access to all DesignSpark content for free! Sign up to be a member Already a DesignSpark member? Login Share this post thumb_upLike star_borderFollow article ILS star_borderFollow ILS is a division of Intelligent Group Solutions Ltd, a well-established industry leading display and opto-electronics solutions provider. ILS offers high level technical skill, professionalism and commercial understanding to companies requiring market leading optoelectronics solutions. ILS is a franchised stocking distributor and agent for amsOSRAM, OSRAM Digital Systems, Inventronics, LEDiL, Stanley, TSLC and Showin. RECOMMENDED ARTICLES Article By ILS INFRARED (IR) LEDS AND WHERE THEY ARE USED Article By ILS LED (LIGHT EMITTING DIODES) BASICS WITH ILS Article By ILS NEW ILS OSRAM OSLON SQUARE UNIFORM LED MODULES Article By BonnieG LED RETROFIT – THE KEY FACTS YOUR NEXT ARTICLE 0 COMMENTS ENJOYING THE DISCUSSION? We notice you haven't signed up for an account yet. 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