CS 27.1397 Colour
specifications
ED Decision 2003/15/RM
Each position light colour must have the applicable International Commission on Illumination chromaticity co-ordinates as follows:
(a) Aviation red: ‘y’ is not greater than 0.335; and
‘z’ is not greater than 0.002.
(b) Aviation green:
‘x’ is not greater than 0.440–0.320y;
‘x’ is not greater than y–0.170; and
‘y’ is not less than 0.390–0.170x.
(c) Aviation white:
‘x’ is not less than 0.300 and not greater than 0.540;
‘y’ is not less than ‘x–0.040’ or ‘yo–0.010’, whichever is the smaller; and
‘y’ is not greater than ‘x + 0.020’ nor ‘0.636–0.400x’;
Where ‘yo’ is the ‘y’ co-ordinate of the Planckian radiator for the value of ‘x’ considered.
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