(Pun intended – with apologies to the goddess Benzaiten and Ben 10)
Despite the billions of research dollars poured into LED research, LEDs produced in a batch
The 1931 observer colour space standard was made during a time when it was thought the red, blue, and green receptor cones in the human eye were uniformly distributed. Now we know better and some lighting manufactures have responded for some time by rating and binning lighting applications at a field of view of 10° (a diameter of 90mm at a distance of half a meter). This rating for colour perception is closer to how our eyes are constructed to perceive colours. With the new scheme, even with the greater angle of viewing, light sources rated for colour matching in ten degrees will have less perceived colour variations than those binned for two degrees. But this scheme is not yet widely adopted.
There have been two attempts by CIE to change the standard observer colour space for the lighting industry from 2° to 10° – one in 1964 (52 years ago) and another one last year (2015). Called the CIE 2015 10° u′ v′ colour space, this latest attempt to bring the standards up to the same level with current knowledge in colour perception is gaining recognition.
At least one famous LED manufacturer, Osram Opto Semiconductors, is now using a ten-degree based white binning method, dubbed ‘Ten°’ (from the CIE 2015 10° u′ v′