MIL-DTL-16377J(SH)
4.8.2 Dielectric withstanding voltage. Fixtures, lights, or parts shall be subjected for 1 minute to a dielectric
test voltage, the effective potential of which is twice rated voltage plus 1,000 volts, applied between points of
polarity and also between live parts and ground. The frequency of the test voltage shall be 60 hertz, root mean
square, alternating current, and shall approximate a true sine wave. (A test potential of twice rated voltage plus 500
volts may be used for fixtures or lights rated 28 volts or less.)
4.8.3 Insulation resistance. After the dielectric withstanding voltage test (see 4.8.2), insulation resistance of the
sample fixtures, lights, or parts shall be measured between all current carrying parts and noncurrent carrying parts
with a megohmeter at a voltage not less than 500 volts direct current, at normal room temperature. This test is not
required for unwired fixtures wherein plastic parts approved by NAVSEA are certified by the manufacturer as
meeting the requirements of 3.6.16.
4.8.4 Optical uniformity test for windows, lenses, globes, and roundels. Windows, lenses, globes, and roundels
furnished either as a part of a fixture or light or as replacement parts shall be examined to ascertain that the product
is of uniform quality as to color, clarity, and freedom from dead zones or streaks. Unless otherwise specified
(see 6.2), the source of light shall be a standard 100-watt, 120-volt, tungsten filament lamp operating at
approximately normal rated voltage. This test may be combined with the operation test of 4.8.1 where the source of
light shall be that of the fixture or light.
4.8.5 Stress relief test for plastic window for type I fixtures and lights. The windows shall be placed between a
pair of polarizing lenses and a light source to determine conformance to 3.8.5.3.
4.8.6 Light output. Unless otherwise specified (see 6.2), test procedure for measuring light output shall
conform to the appropriate IES guides for photometric and colorimetric testing given below and the applicable
specification sheets. Type I and Type II luminaires testing shall be as directed by IES LM-15. Type III luminaires
shall be tested to IES LM-79.
4.8.6.1 Candlepower distribution. When specified in the applicable specification sheet, a candlepower
distribution curve shall be obtained from the sample fixture or light. Before any measurements are taken, the fixture
or light shall be operated until the light output has reached a stable condition.
4.8.6.2 Footcandle distribution. When specified in the applicable specification sheet, a footcandle distribution
curve shall be obtained from the sample fixture or light. Before any measurements are taken, the fixture or light
shall be operated until the light output has reached a stable condition.
4.8.6.3 Color and luminous transmittance. When specified in the applicable specification sheet, the color and
luminous transmittance of windows, globes, roundels, lenses, and filters shall be checked to determine conformance
to 3.7.3.
4.8.6.4 Brightness test for type III luminaires. Brightness (luminance intensity) testing and reports shall be
based on IES LM-79. Maximum brightness shall be determined using a Konica Minolta LS100/110 luminance
meter or equivalent at vertical angles 0, 45, 55, 65, 75, 85, and the lateral angles 0, 45, and 90 degrees.
4.8.6.5 Chromaticity test for type III luminaires. Chromaticity shall be determined in accordance with
IES LM-79 (see 3.7.4).
4.8.6.6 CCT test for type III luminaires. Correlated color temperature shall be determined in accordance with
IES LM-79.
4.8.6.7 CRI test for type III luminaires. The color rendering index shall be determined in accordance with
IES LM-79.
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