Bye-bye CRI?

15 June 2017

The CIE Colour Rendering Index (CRI) (CIE 13.3-1995) and the general colour rendering index, Ra, has for many years been the standard metric for the colour rendition performance of light sources, included in a wide array of international and national standards, directives, regulatory documents and specifications. For some time, however, it has been recognised that the CRI presents limitations particularly for solid state light sources due to their rather different spectral distribution compared to traditional sources.

In 2015, the Illuminating Engineering Society (IES) published IES TM-30-15, which defines a comprehensive new approach based on ninety-nine reference colour samples, reporting fidelity Index (Rf), gamut Index (Rg), and the visual respresentation colour vector graphic. This has been well accepted by the lighting industry but has not yet been adopted by standardisation.

Now that the CIE has published CIE 224:2017, "CIE 2017 Colour Fidelity Index for accurate scientific use", based on the work of IES TM-30-15, does this signal the demise of the loved (and sometimes hated) CRI?

Categories: General & Specialty Lighting, Consumer products & Textile

More articles

IEC embraces multi-junction PV devices

The IEC has added to its 60904 series a new standard, IEC 60904-8-1:2017, "Photovoltaic devices - Part 8-1: Measurement of spectral responsivity of multi-junction photovoltaic (PV) devices". This provides important information on...

Categories: Solar & Photovoltaics

The IEC addresses characterisation of the blue light hazard

Researchers around the world have raised concerns about the safety of LED lighting on a regular basis, with focus ranging from the impact of blue light to issues such as disability glare. In a multipart series of articles that...

Introduction to IEC TR 62778 (LS16 Poster and Presentation)

Driven by the desire to circumvent issues encountered in applying IEC/EN 62471, and to reduce the measurement burden of luminaire manufacturers, a new approach to the evaluation of the photobiological safety of luminaires is now...