MIL-DTL-25866C
3.4.3.1 Handle. A handle shall be provided for carrying the light. The configuration of
the handle to be provided shall be subject to approval by the procuring activity.
3.4.4 Lights of different construction. Lights of slightly different construction will be
considered to be in accordance with the requirements, provided the specified and limiting
dimensions, mounting holes, connections, and all other requirements specified herein are met
and the design is approved by the procuring activity.
3.5 Performance. Unless otherwise specified, the light shall be capable of operating
satisfactorily under the following conditions:
a. Temperature ranging from -65 to 160 °F (-54 to 71 °C), except for reduction in-battery
capacity.
b. Pressures ranging from 30 to 13.7 inches of mercury (inHg) (approximately an
altitude of 20,000 feet).
c. Relative humidity up to 95 percent including conditions wherein condensation takes
place in the form of both water and frost.
d. Sand and dust particles as will be encountered in desert areas.
e. Exposure to salt-sea atmosphere.
f. Operation in an explosive vapor within or surrounding the equipment.
g. Vibration incident to service use.
h. Acceleration and shock forces as anticipated.
i. Underwater operation.
3.5.1 Illumination (photometric). The light shall be designed in such a manner as to
provide the following illumination. When properly installed and operated at rated lamp voltage,
the candlepower distribution in any plane containing an axis which passes through the light
center and is perpendicular to the mounting plate (0 degree axis) shall equal or exceed the values
in table I.
TABLE I. Candlepower distribution.
Candlepower
Minimum width with
respect to 0° axis
7
-5° to +5°
5
-10° to +10°
3
-15° to +15°
4
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