CIELUV

or more specifically CIE 1976 L*, u*, v*; A Color Space of the CIE 1976 Color Model that is an update of the CIEUVW Color Space. It contains all of the colors that are visible to the Standard Observer. It is the second most common format of Chromaticity Diagram after CIEXYZ. Unlike CIEXYZ, it is intended to be Perceptually Uniform. It is similar to CIELAB – published at the same time – but it is recommended for additive colors (screens and other color displays).