Chris,
        Seems to me that if these are a true driving light then they are the
equivalent of a high beam light, if not even more powerful and should only
be used when your high beams would normally be on.  (Flame suit on!)

  Also you must remember that the Vanagon lamps are placed much higher than
most vehicles.  When you are following someone, even if the lights are
adjusted correctly, your lights will seem brighter/misadjusted to them as it
will fill their mirrors with light.

For what its worth!

Mark
82 Westy