MIL-PRF-22885/104C
TABLE I. Illuminated color, contrast, and luminance.
Chromaticity limits
Luminance contrast ration 1/ 2/
Nominal
(X/Y) X
(X/Y)
Without EMI shield
With EMI shield
brightness
X
Y
(foot-lamberts)
Lighted
Unlighted
Lighted
Unlighted
Max ±
Without
Max ± Avg.
Y
Color
Code
Min Avg.
Min Avg.
EMI shield
(X/Y)
(X/Y)
Avg.
.660/.340
.703/.297
Red
R
.60 : 1
-.10 : 1
.35 : 1
-.14 : 1
280
.655/.324
.695/.285
.340/.640
.415/.565
Green
G
.60 : 1
-.10 : 1
.35 : 1
-.12 : 1
260
.300/.600
.375/.523
.585/.415
.610/.390
Amber
A
1.20 : 1
-.08 : 1
.75 : 1
-.11 : 1
500
.574/.404
.599/.379
.560/.440
.583/.417
Yellow
Y
1.40 : 1
-.04 : 1
.95 : 1
-.09 : 1
600
.549/.429
.572/.405
.430/.430
.500/.430
White
N
.80 : 1
-.10 : 1
.45 : 1
-.12 : 1
350
.430/.380
.500/.380
.230/.420
.320/.420
Blue
B
.03 : 1
-.10 : 1
-.02 : 1
-.15 : 1
70
.230/.350
.320/.350
1/ Displays with luminance contrast ratios of .6 or higher in lighted condition and ±.1or lower in unlighted condition
are considered readable under direct sunlight conditions. In addition to luminance contrast, color contrast is an
important factor in readability. Colors are listed in order of general preference. Red has the best color contrast; blue
and white have the poorest color contrast under sunlight conditions. Blue should be used only when absolutely
necessary.
2/ Sunlight performance is diminished 50 percent when two colors per legend area are specified (see figure 4).
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