MIL-PRF-22885/110C
Color and luminance: See tables I and II.
Sunlight readability: Applicable to display type S switches only.
Contrast with lamps illuminated: Measurements shall be taken with φ1 = 45 degrees and φ2 = 0 degrees only.
(This procedure does not test readability under specularly reflective (glare) condition.)
Night vision imaging system (NVIS) compatibility: Applicable to display type S switches only.
TABLE I. Luminance.
Foot-lamberts 1/
Color
Display
Color
code
type
Without EMI/RFI requirement
With EMI/RFI requirement
Standard displays 2/
Sunlight readable: Legend is not legible until illuminated. When illuminated, legend appears in color;
background remains black.
S
Yellow
Y
350
300
S
Red
R
200
175
S
Green
Z
250
200
S
White
D
250
200
S
Blue
B
200
175
NVIS compatible displays 3/
Sunlight readable: Legend is not
Full
Half
Quarter
Full
Half
Quarter
legible until illuminated. When
display
display
display
display
display
display
illuminated, legend appears in
4/
4/
4/
4/
4/
4/
color; background remains black.
S
Green A
H
250
200
150
200
150
130
S
Green B
J
250
200
150
200
150
130
S
Yellow
K
250
200
150
200
150
130
S
Red
L
180
150
150
160
150
130
1/ Minimum average.
2/ Standard displays shall be illuminated by four T-1 subminiature flange base lamps of 0.15 ±.01 mean
spherical candlepower (mscp).
3/ NVIS compatible displays shall be illuminated by four T-1 subminiature flange base lamps of 0.22 ±.01
mean spherical candlepower (mscp).
4/ Display segments are as defined in table V.
5
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