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?
Using a second embedded camera as a smart viewfinder, the TEL310 can now intelligently align itself with the brightest part of your target light source... or with whatever part of it you click on in the live view!
Bentham are pleased to announce the launch of the BPC300-C Photochromic Contact Lens Spectrophotometer, a complete solution for the automatic characterisation of photochromic (sun-darkening) prescription contact lenses.
We're recruiting for a Head of Optical Metrology
We're looking for someone who's had hands on experience with with optical measurements to manage our team and promote the Bentham measurement service to our customers.