MIL-PRF-22885/55G
REQUIREMENTS:
Design and construction: See figure 1. Color filters shall be capable of mating with pushbuttons in accordance with
MIL-PRF-22885/53.
Temperature characteristic: 1 (-55°C to +85°C).
Color and luminance: See table I.
Part or Identifying Number (PIN): See table II.
Qualification inspection: As a part of illuminated push button switch assembly, MIL-PRF-22885/56.
TABLE I. Chromaticity limits and photometric brightness.
Switch photometric brightness
Chromaticity limits 1/
Color
Color
(foot-lamberts) 2/
2360° Kelvin
code
minimum
x
y
.280
.210
.280
.330
25
Blue
B
.420
.330
.420
.210
.570
.260
.630
.300
50
Green
G
.660
.160
.720
.200
.285
.695
SL 3/
.703
Red
R
80
.655
.325
.660
SL 3/
.350
.380
.385
.460
150
White
W
.430
.460
.410
.380
.415
.562
SL 3/
.570
Yellow
Y
150
.596
.382
.605
SL 3/
1/ The chromaticity of the assembled illuminated display, expressed as x and y
coordinates on the CIE chromaticity diagram, shall lie within areas bounded by the
coordinates listed for each color, using a source illuminate of 2360°K.
2/ Switch photometric brightness, when viewed from the front of the applicable
pushbutton display and using midget flange, T-1 ¾ incandescent lamps operated
at a .34 ±.02 MSCP.
3/ SL = Spectrum Locus (where intersected by other coordinate pair).
2