Figure 2-64.Accepted beam pattern for a four-headlight
Blackout lighting is a requirement for certain
combat operations. The purposes of blackout lighting
are as follows:
To provide the vehicle operator with sufficient
light to operate the vehicle in total darkness
To provide minimum lighting to show vehicle
position to a leading or trailing vehicle when
illumination must be restricted to a level not
visible to a distant enemy
The three types of blackout lighting are as follows:
The BLACKOUT DRIVING LIGHT (fig. 2-65)
is designed to provide a white light of 25 to 50
candlepower at a distance of 10 feet directly in
front of the light. The light is shielded so that the
Figure 2-65.Blackout driving light.
top of the low beam is directed not less than 2
degrees below the horizon. The beam
distribution on a level road at 100 feet from the
light is 30 feet wide.
The BLACKOUT STOP/TAILLIGHT and
MARKER LIGHT (fig. 2-66) are designed to be
visible at a horizontal distance of 800 feet and
not visible beyond 1,200 feet. The lights also
must be invisible from the air above 400 feet
with the vehicle on upgrades and downgrades of
20 percent. The horizontal beam cutoff for the
lights is 60 degrees right and left of the beams
center line at 100 feet.
The COMPOSITE LIGHT (fig. 2-67) is
currently the standard light unit that is used on
the rear of tactical military vehicles. The
composite light combines service stop, tail, and
turn signals with blackout stop and taillighting.
Figure 2-66.Blackout stop/taillight and marker light.
Figure 2-67.Military composite light.