Quantcast Blackout Lights

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Figure 2-64.—Accepted beam pattern for a four-headlight system. BLACKOUT  LIGHTS 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. 2-48 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.



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