MIL-PRF-44259E
3.4.5 Ballast. Lights shall operate through a ballast that is designed to provide thermal
protection, by inherently limiting case temperatures, or by the use of a reset able fuse. The
ballast temperature limiting is 158 °F when tested as specified in 4.4.6. The temperature rating
shall be consistent with the capabilities of material and components in the ballast. The ballast
shall be designed and assembled to conform to ANSI C82.11 unless requirements in this
specification state otherwise. The ballast shall operate on either 50 or 60 Hz ± 5 Hz, and shall
function properly when tested as specified in 4.4.1 through 4.4.16.
3.4.6 Interconnection of lights. The lights shall be of a design to provide for
interconnecting a string of up to 12 lights maximum while plugged into a ground fault circuit
interrupt (GFCI) meeting requirements of UL 943. Feed through power connectors and wiring
shall be rated for a 10 amp load. Each light shall operate independently on the through power
circuit. Individual lights and lights connected in series shall be capable of operating without
tripping the GFCI when tested as specified in 4.4.16.
3.4.7 Dielectric strength. The light assembly shall be capable of withstanding
1,000 volts AC, 60 Hz between supply terminals (black and white) and with ground lead
(green) grounded for a maximum period of 15 seconds when tested as specified in 4.4.7.
3.4.8 Electromagnetic capability. The complete light assembly shall meet the basic
electromagnetic interference limits as specified under test method RE 102 for Army ground
applications and CE 102 of MIL-STD-461 when tested as specified in 4.4.1.
3.4.9 Continuity-insulation resistance. Each light assembly shall have a direct current
(DC) resistance of less than 1 ohm when tested for electrical continuity as specified in 4.4.8. In
addition, insulation resistance shall be greater than 100 mega-ohms when tested as specified in
4.4.9.
3.4.10 Illumination. An individual light shall provide a minimum illumination of
140 foot candles when measured 18 inches from the surface of the assembly at the midpoint of
the assembly using a cosine corrected photometer probe when tested as specified in 4.4.4.
3.4.10.1 Filter. The blue filter shall reduce the illumination of the light assembly to
15 - 25 foot candles when measured 35.00 ± .25 inches from the surface of the assembly at the
midpoint and at either end using a cosine corrected photometer probe when tested as specified in
4.4.4.1. The filter shall meet the chromaticity requirements of u'=.180, v'=.500, and r'=.055 on
figure 1. No more than .5 percent of the total energy emitted shall be above 700 manometers and
begin as close to 600 nanometers as possible. Ninety-five percent of the total energy should be
confined within 400-600 nanometers.
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