§29.1397 Colour specifications

Each posi tion l ight col our m ust have the applicable In ternational Co mmission o n 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) Av iation white: ‘x’ i s not l ess t han 0.300 and not great er t han 0.540; ‘y’ i s not l ess t han ‘x–0.040’ or ‘yo–0.010’, whichever is the smaller; and ‘y’ is not great er t han ‘x+0.020’ nor ‘0.636– 0.400x’. Where ‘y o’ is the ‘y ’ co-ordinate of the Planckian radiator for the value of ‘x’ considered.