MIL-DTL-16377J(SH)
3.7.7.6 Mechanical shock. Glassware shall be resistant to one impact of a free falling 3-pound polished steel
ball striking the glassware as specified in 4.8.17.3.
3.7.7.7 Thermal shock. Glassware shall withstand the stresses produced when tested as specified in 4.8.17.4
without visible or structural damage.
3.7.7.8 External hydrostatic pressure. Glassware shall withstand the stresses produced when tested as specified
in 4.8.17.5 without visible or structural damage.
3.7.7.9 Breakage pattern. Breakage pattern shall be characterized by complete fracture of the glassware into
small rectangular pieces predominantly not exceeding 2½ by inches when tested as specified in 4.8.17.6.
3.7.8 Reflectors. Reflectors shall be as specified in the applicable specification sheet, or of the size and shape
necessary to produce the distribution curve required (see 3.7.1 and 3.7.2). Reflectors for Type I fixtures shall be
made of aluminum sheet (manufacturer s choice) not less than 0.019 inch thick. Reflectors shall be reinforced to
prevent noise when a fixture is tested as specified in 4.8.9. Clearance of holes of a size to accept the socket wrench
for ¼-20 hexagon nut shall be cut in the reflector where necessary to facilitate replacement of shock mounts in
Type I or Type III, Class 2 fixtures. The holes shall align with shockmount hexagon nuts when the reflector is
assembled in the enclosure. For finish of reflectors, see 3.8.3. Material for specular reflectors shall be aluminum
pre-finished lighting sheet having a specular reflectance factor of not less than 80 percent. Plastic coating for
specula reflecting surface is not acceptable.
3.7.9 Filters. Colored filters shall be as specified in the applicable specification sheet and herein.
3.7.9.1 Red filter tubes for type I, class 2 fixtures. When specified (see 6.2), or when required by the applicable
specification sheet, red filter tubes for insertion over Type I lamps for use in red illumination shall be furnished
installed in the fixtures. The procedures specified herein shall apply when red filter tubes are installed in the Type I
standard fixtures. No symbol numbers or National Stock Numbers will be assigned for these fixtures.
3.7.9.1.1 All red fixture(s). "(R)" shall be placed next to the symbol number specified in the applicable
specification sheet to signify an all red fixture; that is, red filter tubes have been installed on all lamps.
3.7.9.1.2 Single red with white fixture(s). "(R&W)" shall be placed next to the symbol number specified in the
applicable specification sheet to signify a combination red and white fixture; that is, a red filter tube has been
installed on one lamp of a two-lamp fixture or on the center lamp of a three-lamp fixture.
3.7.9.1.3 Two red with white fixture(s). "(2R&W)" shall be placed next to the symbol number specified in the
applicable specification sheet to signify a combination red and white fixture; that is, red filter tubes have been
installed on the two outer lamps of a three-lamp fixture.
3.7.9.1.4 Red directional fixture(s). Installation of red filter tubes in directional fixtures shall be as specified in
the applicable specification sheet. "(R&W)" shall be placed next to the symbol number specified in the applicable
specification sheet to signify combination red and white fixture.
3.7.9.2 Blue filter tubes for type I fixtures. Identical requirements specified in 3.7.9.1 apply except blue "(B)"
is substituted for red "(R)."
3.7.9.3 Gray filter tubes for type I fixtures. Identical requirements specified in 3.7.9.1 apply except gray "(G)"
is substituted for red "(R)."
3.7.9.4 Night vision friendly filter tubes for type I fixtures. Identical requirements specified in 3.7.9.1 apply
except night vision "(NV)" is substituted for red "(R)."
3.7.9.5 Amber filter tubes for type I fixtures. Amber filter tubes are used to replace red filters during peace
time as appropriate. There is no change to the symbol number of the fixture. The nomenclature of 3.7.9.1 applies.
3.7.10 Type III lens color. New design Type III and legacy Type II replacements luminaires may use a clear
lens for red, amber, green, blue, or cyan lighting applications. The visible LED circuit board shall identify the
illumination color.
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