MIL-DTL-16377J(SH)
3.7 Light output and associated hardware.
3.7.1 Candlepower distribution for fixtures. Candlepower distribution curves shall be symmetrical to and shall
be within +20/-10 percent of the curves shown in the applicable specification sheet. For angles above 80 degrees
that have a candlepower of 50 or less, the +20/-10 percent rule does not apply. Tests shall be conducted as specified
in 4.8.6.
3.7.1.1 Lumen output for emergency class 2 lighting. Light fixtures designed to run on an internal battery
back-up after loss of power shall provide a minimum of 240 lumens initially and no less than 140 lumens after
5 hours of battery run-time. Tests shall be conducted as specified in 4.8.6.8.
3.7.2 Footcandle distribution for fixtures. Footcandle distribution curves shall be symmetrical to and shall be
not less than 90 percent or more than 120 percent of the curves as shown in the applicable specification sheet. Tests
shall be conducted as specified in 4.8.6.
3.7.3 Color (chromaticity) and luminous transmittance for parts. The chromaticity in CIE coordinates and
luminous transmittance for parts such as windows, globes, roundels, lenses, filters, and others shall be as specified in
the applicable specification sheet and as specified herein. Color and luminous transmittance of plasticware parts
shall be in accordance with MIL-DTL-24191. Color and luminous transmittance requirements shall be met prior to
application of any diffusing process. If stippling is used for diffusing, the stippled surface shall be ground down and
polished to a smooth surface or a test specimen shall be molded to a smooth surface of a nominal thickness as shown
in the specification sheet for the part to be tested.
3.7.3.1 Red transparent. Red transparent color shall fall within the area bounded by the spectrum locus and
y = 0.335, x = 0.985-y as shown on figure 8. Red glassware shall have a light transmission value that essentially
3.7.3.2 Yellow transparent. Yellow transparent color shall fall within the areas bounded by the spectrum locus
and
y = 0.382
x = 0.454 + 0.240y
y = 0.790 - 0.667x
x = 0.698 - 0.333y
as shown on figure 8. Luminous transmittance, using CIE Illuminant A, shall be not less than 50 percent when
specimens are tested as specified in 4.8.6.
3.7.3.3 Green transparent. Green transparent color shall fall within the area bounded by the spectrum locus and
y= 0.390 - 0.171x
x = 0.360 - 0.080y
x = 0.650y - 0.030
as shown on figure 8. Luminous transmittance, using CIE Illuminant A, shall be not less than 20 percent when
specimens are tested as specified in 4.8.6.
3.7.3.4 Blue transparent. Blue transparent color shall fall within the area bounded by the spectrum locus and
y = 0.230
x = 0.133 + 0.600y
x = 0.400 - y
as shown on figure 8. Luminous transmittance, using CIE Illuminant A, shall be not less than 2 percent when
specimens are tested as specified in 4.8.6.
3.7.3.5 White translucent. White translucent, when tested as specified in 4.8.6, shall have luminous
transmittance as specified in the applicable specification sheet. Transmitted light shall be distributed uniformly
through the plastic.
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