MIL-DTL-16377J(SH)
3.7.4.5 Night vision device (NVD) friendly cyan light. Night vision device friendly cyan chromaticity shall be
within the area bounded by the spectrum locus and the following:
x = 0.0687
x = 0.2030
y = 0.2000
y = 0.3560
x = 0.1623
x = 0.0280
y = 0.2000
y = 0.3850
3.7.4.5.1 Night vision radiant intensity. The Night Vision Radiant Intensity (NRIa) values are defined by
SAE-ARP4392 and SAE-ARP5825. The NRIa is equal to the unscaled Night Vision Radiance (NRa) multiplied by
the square of the distance (in centimeters) from the light source to the measurement plaque. All NVD friendly
luminaires, when measured in accordance with MIL-STD-3009, shall not have an NRIa exceeding 5E-03.
3.7.5 Brightness for type III luminaires. Brightness (luminance intensity) shall not exceed the following limits.
The brightness requirement is applicable to only Type III, Class 2 luminaires (see 4.8.6.4).
3.7.5.1 Brightness at nadir. Brightness shall not exceed 15,000 candela per square meter for the entire
illuminated area for the vertical angle of 0 (see 4.8.6.4).
3.7.5.2 Brightness at angle. Brightness shall not exceed 8,000 candela per square meter for the entire
illuminated area for the vertical angles of 45 degrees and above (see 4.8.6.4).
3.7.5.3 Local brightness. The ratio of the maximum luminance (luminance of the brightest 1-inch diameter) to
the average luminaire luminance determined in 3.7.5.2 shall not exceed 5:1 at angles of 45, 55, 65, 75 and 85
degrees from nadir for crosswise and lengthwise viewing (see 4.8.6.4).
3.7.6 Windows and window assemblies. Windows and window assemblies shall be as specified in the
applicable specification sheet and herein.
3.7.6.1 Windows and window assemblies for type I fixtures. Finish shall be as specified in 3.8.4.1. Annealing
3.7.6.1.1 Material for windows. Material for windows shall be cast, or ASTM D4802 melt process Category
M-1, acrylic plastic sheet in accordance with MIL-DTL-24191 of a type and grade as specified in the applicable
specification sheet. The requirements of MIL-DTL-24191 shall apply to the flat material prior to forming or
fabrication. Windows after forming or fabrication shall be as specified in the applicable specification sheet.
Injection molded, or extruded material, is not permitted for parts that are formed to a specific shape. Flat windows
may be made from extruded sheet.
3.7.6.1.1.1 Optical uniformity. Windows shall be free from defects, such as imbedded particles, bubbles,
scratches, blemishes, and striation, which will seriously affect the optical properties.
3.7.6.1.1.2 Corners. In the process of fabrication of windows, the three-sided corners shall not be reduced in
excess of 30 percent of the nominal window thickness specified in the applicable specification sheet. This wider
tolerance shall be limited to an area bounded by the hypotenuse of three right-angled triangles, ¾ by ¾ inch, placed
so that their vertex is at the point of the outside surface of the corner.
3.7.6.1.2 Louver assembly. The louver assembly shall be as specified in the applicable specification sheet and
herein. Finish shall be as specified in 3.8.4.2.
3.7.6.1.2.1 Material. Material for louver assemblies shall be aluminum. Mounting hardware and grounding
straps are excluded.
3.7.6.1.2.2 Attachment to window. The louver assembly shall be attached to the window as specified on
figure 4 for attaching louvers to watertight plastic windows.
3.7.6.1.2.3 Louver grounding. The louver assembly shall be grounded to the fixture housing through the
mounting screws. Louver grounding shall be continuous from one mounting screw to the other.
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