(9)‘excitation purity’ means a percentage computed for a CTLS set to emit light of a certain colour, using a procedure further defined in standards, by drawing a straight line on an (x and y) colour space graph from a point with colour coordinates x=0,333 and y=0,333 (achromatic stimulus; point 1), going through the point representing the (x and y) colour coordinates of the light source (point 2), and ending on the outer border of the colour space (locus; point 3).
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