Document ID: chunk:federal_register_of_legislation:F2024C01244:reg:5:p62
Version: federal_register_of_legislation:F2024C01244
Segment Type: reg
Provision Reference: reg 5 (pt 62/225)
Character Range: 474706–477891

observer and coordinate system adopted by the International Commission on Illumination (CIE).

    Table 9.14 Chromaticity for incandescent lights

Red
            Purple boundary y = 0.980 – x
            Yellow boundary
            (visual approach light
            indicator systems only) y = 0.320
            Yellow boundary
            (all other lights) y = 0.335

Yellow
            Red boundary y = 0.382
            White boundary y = 0.790 – 0.667x
            Green boundary y = x – 0.120

Green
            Yellow boundary y = 0.726 – 0.726x
            White boundary x = 0.650y
               (except for visual
              docking guidance systems)
            White boundary x = 0.625y – 0.041
               (for visual docking
              guidance systems)
            Blue boundary y = 0.390 – 0.171x

Blue
            Green boundary y = 0.805x + 0.065
            White boundary y = 0.400 – x
            Purple boundary x = 0.600y + 0.133

White
            Yellow boundary x = 0.500
            Blue boundary x = 0.285
            Green boundary y = 0.440 and y = 0.150 + 0.640x
            Purple boundary y = 0.050 + 0.750x and y = 0.382

Variable White
            Yellow boundary x = 0.255 + 0.750y and x = 1.185 – 1.500y
            Blue boundary x = 0.285
            Green boundary y = 0.440 and y = 0.150 + 0.640x
            Purple boundary y = 0.050 + 0.750x and y = 0.382

     Figure 9.14   Colours for incandescent aeronautical ground lights

9.15 Chromaticity for solid state (LED) lights

       (1) Subject to subsection (2), the chromaticity of aeronautical ground lights with solid state (LED) light sources must be within the boundaries as shown in Table 9.15 and Figure 9.15.

    Table 9.15 Chromaticity for solid state (LED) lights

Red
            Purple boundary  y = 0.980 – x
                                  Yellow boundary
                                  (for VASI) y = 0.320
                                  Yellow boundary
                                  (other than VASI) y = 0.335

Yellow
            Red boundary y = 0.387
            White boundary y = 0.980 – x
            Green boundary y = 0.727x + 0.054

Green
            Including:
            Yellow boundary x = 0.310
            White boundary x = 0.625y – 0.041
            Blue boundary y = 0.400

White (including variable white)
            Yellow boundary x = 0.440
            Blue boundary x = 0.320
            Green boundary y = 0.150 + 0.643x
            Purple boundary y = 0.050 + 0.757x

Blue
 Green boundary  y = 1.141x – 0.037
  White boundary  y = 0.400 – x
  Purple boundary  x = 0.134 + 0.590y

       (2) For the colour green, signals within a lighting system must be within one but not both of the following sets of boundaries:

(a) either these:

           Yellow boundary y = 0.726 – 0.726x
           White boundary x = 0.625y – 0.041
           Blue boundary y = 0.400; or
Note   The presentation of green within this boundary is recommended where observers with defective colour vision are required to determine the green colour of the light signal as opposed to other colours.

(b) these:

           Yellow boundary x = 0.310