The problem of uneven LED colour is well known - LED video screens with patchy, uneven colours or 12 LED wash lights with 12 different versions of the 'same' colour. Despite advances in LED manufacturing, even LEDs in so-called 'tight' bins have noticeable differences in colour and these differences get exponentially worse when mixing colours. Martin uses colour calibration across its entire LED product line to eliminate this problem.
(Jim Evans)