lighting, aircraft, night vision imaging system - General Dynamics ...

MIL-STD-3009
4.3.4 Chromaticity.
The color of illuminated information (alphanumeric and symbolic) on instruments,
controls, control panels, and on illuminated areas in designated crew station and
compartment areas shall be as specified herein for that component. These lighting
colors and limits are shown on the chromaticity diagram in FIGURE 2 and are
designated as “NVIS GREEN A,” “NVIS GREEN B,” “NVIS YELLOW,” “NVIS RED,” and
"NVIS WHITE." Conformance to these colors and color limits is determined by the
following formula:
(u’ - u’1) 2 + (v’ - v’1) 2 ≤ (r) 2 (Formula 1)
Where:
.
u’ and v’ = 1976 UCS chromaticity coordinates of the test article.
u’1 and v’1 = 1976 UCS chromaticity coordinates of the center point of the specified
color area
r = radius of the allowable circular area on the 1976 UCS chromaticity diagram for
the specified color
See APPENDIX B for NVIS type I, Class A sample calculations.
4.3.4.1 Primary lighting chromaticity.
The chromaticity of the primary lighting system for instruments, displays, consoles, and
checklist and radio control plates shall be as specified in TABLE II. At the luminance
level specified in TABLE II, the u’ and v’ chromaticity coordinate values shall be within
the area bounded by a circle as shown in FIGURE 2.
4.3.4.2 Secondary lighting subsystem chromaticity
The secondary lighting subsystem shall illuminate the instruments, displays, consoles,
and checklist and radio control plates with a lighting color as specified in TABLE II.
Lighting components shall produce u’ and v’ chromaticity coordinates within the area
bounded by a circle as shown in FIGURE 2 when energized to produce the luminance
level specified in TABLE III measured off a reflectance standard (see APPENDIX A)
4.3.4.3 Illuminated control chromaticity.
Control lighting color shall be as specified in TABLE II. At the luminance level specified
in TABLE II, the u’ and v’ chromaticity coordinate values shall be within the area
bounded by a circle as shown in FIGURE 2.
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