1.3.2
NVIS Compliant
When specified, the VIVISUN® display lighting is compatible with NVIS (Night Vision Imaging System) goggles and complies with the NVIS color and NVIS radiance requirements as defined in MIL-L-85762A and MIL-STD 3009, except as noted.
NVIS Colors and Chromaticity Coordinates
NVIS lighting is available in six MIL-STD-3009 compliant colors listed below (NVIS Green A, NVIS Green B, NVIS Yellow - Class A, NVIS Yellow - Class B, NVIS White, and NVIS Red), plus NVIS Blue and Alternate NVIS Red. Alternate NVIS Red is typically used in civil NVIS applications which do not require MIL-STD-3009 compliance as it exceeds the allowable NVIS Radiance and falls outside the chromaticity coordinates for NVIS Red. Typical 1976 CIE UCS chromaticity coordinates for each color are within the bounded areas shown in Figure 1.3.2-A.
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Sunlight Readability - NVIS (Display Type S)
Type S displays are sunlight readable and meet the contrast ratio requirements of MIL-PRF-22885 with an opaque black background containing indiscernible legends until illuminated. When energized at rated voltage, the display legends are readable in 10,000 footcandles of direct sunlight including any glare producing angle up to 15° to the normal of the viewing surface. When the display is not energized the legends are hidden and cannot be read in direct sunlight. The display contrast values meet or exceed the minimum contrast requirements of MIL-PRF-22885F.
The minimum contrast values for each color at full rated voltage are shown below.
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Figure 1.3.2-B Minimum Contrast Values |
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|---|---|
| Color | Contrast @ 15° |
| NVIS Blue | 0.60 |
| NVIS Green A | 0.60 |
| NVIS Green B | 0.60 |
| NVIS White | 0.60 |
| NVIS Yellow Class A | 0.60 |
| NVIS Yellow Class B | 0.60 |
| NVIS Red | 0.40 |
| Alt. NVIS Red | 0.40 |
See Appendix D for information about the luminance of other cap voltage options.
NVIS Radiance
The NVIS compliant lighting meets the following MIL-STD-3009 NVIS radiance requirements when set to the stated luminance levels.
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Figure 1.3.2-C Radiance Requirements |
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|---|---|---|---|---|
| Color | NVIS Radiance | NVIS Type / Class |
Luminance for NVIS Radiance Measurement (footlamberts) |
|
| Maximum | Minimum | |||
| NVIS Blue | <= 1.7E-10 | none | Type I Class A | 0.1 |
| NVIS Green A | <= 1.7E-10 | none | Type I Class A | 0.1 |
| NVIS Green B | <= 1.7E-10 | none | Type I Class A | 0.1 |
| NVIS White | <= 1.0E-9 | none | Type I Class A | 0.1 |
| NVIS Yellow Class A | <= 1.5E-7 | >= 0.5E-7 | Type I Class A | 15.0 |
| NVIS Yellow Class B | <= 1.4E-7 | >= 0.47E-7 | Type I or II Class B | 15.0 |
| NVIS Red | <= 1.4E-7 | >= 0.47E-7 | Type I or II Class B | 15.0 |
| Alt. NVIS Red is excluded from this chart since it does not meet the NVIS Radiance requirements of MIL-STD-3009. | ||||
NVIS Class A is defined as using a 625 nm minus blue filter which does not allow the use of red cockpit lighting. NVIS Class B is defined as using a 665nm minus blue filter which does allow for the use of properly designed NVIS red lighting.